nil pointer dereference on Hetzner cloud

Hi, while bootstrapping new clusters with Kubermatic version 1.16 I found the following bug with the machine-controller in customer-clusters:

Machine Controller Image: docker.io/kubermatic/machine-controller:v1.24.4
Kubermatic version: 1.16
K8s Server Version: Server Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.3", ..}

kubectl describe pod/machine-controller-..:

Name:         machine-controller-7584cf7c44-tmzvn
Namespace:    cluster-tsq85kvtfr
Priority:     0
Node:         master-pool1-6b9c9755b8-7726s/192.168.0.8
Start Time:   Tue, 01 Jun 2021 11:15:33 +0200
Labels:       app=machine-controller
              cluster=tsq85kvtfr
              machinecontroller-kubeconfig-secret-revision=25584
              pod-template-hash=7584cf7c44
Annotations:  cni.projectcalico.org/podIP: 10.244.4.19/32
              cni.projectcalico.org/podIPs: 10.244.4.19/32
              prometheus.io/path: /metrics
              prometheus.io/port: 8080
              prometheus.io/scrape: true
Status:       Running
IP:           10.244.4.19
IPs:
  IP:           10.244.4.19
Controlled By:  ReplicaSet/machine-controller-7584cf7c44
Init Containers:
  copy-http-prober:
    Container ID:  docker://aba3fb536e0101bcf1fdba44a3951b7ba24aeb948fd5f3b6dc69646cc284f1bd
    Image:         quay.io/kubermatic/http-prober:v0.3.1
    Image ID:      docker-pullable://quay.io/kubermatic/http-prober@sha256:1dfe3b3eedcf35f37bcc0d483847eff00337c57ee7d963236ba3e5f6d643c47e
    Port:          <none>
    Host Port:     <none>
    Command:
      /bin/cp
      /usr/local/bin/http-prober
      /http-prober-bin/http-prober
    State:          Terminated
      Reason:       Completed
      Exit Code:    0
      Started:      Tue, 01 Jun 2021 11:15:34 +0200
      Finished:     Tue, 01 Jun 2021 11:15:34 +0200
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /http-prober-bin from http-prober-bin (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-sw4sl (ro)
Containers:
  machine-controller:
    Container ID:  docker://2345b8e52d6620e2f79154b523cec84953de576e4b5fd3615e6dec308f5a6b1c
    Image:         docker.io/kubermatic/machine-controller:v1.24.4
    Image ID:      docker-pullable://kubermatic/machine-controller@sha256:ecfe580aa664370e246d33592aa22a2b4878c926a62ba0d90e489ca36e5c0129
    Port:          <none>
    Host Port:     <none>
    Command:
      /http-prober-bin/http-prober
    Args:
      -endpoint
      https://apiserver-external.cluster-tsq85kvtfr.svc.cluster.local./healthz
      -insecure
      -retries
      100
      -retry-wait
      2
      -timeout
      1
      -command
      {"command":"/usr/local/bin/machine-controller","args":["-kubeconfig","/etc/kubernetes/kubeconfig/kubeconfig","-logtostderr","-v","4","-cluster-dns","169.254.20.10","-health-probe-address","0.0.0.0:8085","-metrics-address","0.0.0.0:8080"]}
      --crd-to-wait-for
      Machine,cluster.k8s.io/v1alpha1
    State:          Waiting
      Reason:       CrashLoopBackOff
    Last State:     Terminated
      Reason:       Error
      Exit Code:    2
      Started:      Tue, 01 Jun 2021 11:25:07 +0200
      Finished:     Tue, 01 Jun 2021 11:25:41 +0200
    Ready:          False
    Restart Count:  6
    Limits:
      cpu:     2
      memory:  512Mi
    Requests:
      cpu:     25m
      memory:  32Mi
    Liveness:  http-get http://:8085/readyz delay=15s timeout=15s period=10s #success=1 #failure=3
    Environment:
      HZ_TOKEN:    MpuX4GCmRLAg2ThelxcXYpMrDRuzUVp6exHsCrEu1eEdjkRwuq9aVg6PEsWbzh6f
      KUBECONFIG:  /etc/kubernetes/kubeconfig/kubeconfig
    Mounts:
      /etc/kubernetes/kubeconfig from machinecontroller-kubeconfig (ro)
      /http-prober-bin from http-prober-bin (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-sw4sl (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             False
  ContainersReady   False
  PodScheduled      True
Volumes:
  machinecontroller-kubeconfig:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  machinecontroller-kubeconfig
    Optional:    false
  http-prober-bin:
    Type:       EmptyDir (a temporary directory that shares a pod's lifetime)
    Medium:
    SizeLimit:  <unset>
  default-token-sw4sl:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-sw4sl
    Optional:    false
QoS Class:       Burstable
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                 node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
  Type     Reason     Age                   From               Message
  ----     ------     ----                  ----               -------
  Normal   Scheduled  11m                   default-scheduler  Successfully assigned cluster-tsq85kvtfr/machine-controller-7584cf7c44-tmzvn to master-pool1-6b9c9755b8-7726s
  Normal   Pulled     11m                   kubelet            Container image "quay.io/kubermatic/http-prober:v0.3.1" already present on machine
  Normal   Created    11m                   kubelet            Created container copy-http-prober
  Normal   Started    11m                   kubelet            Started container copy-http-prober
  Normal   Pulling    11m                   kubelet            Pulling image "docker.io/kubermatic/machine-controller:v1.24.4"
  Normal   Pulled     11m                   kubelet            Successfully pulled image "docker.io/kubermatic/machine-controller:v1.24.4" in 6.414382595s
  Warning  Unhealthy  8m36s (x3 over 10m)   kubelet            Liveness probe failed: Get "http://10.244.4.19:8085/readyz": dial tcp 10.244.4.19:8085: connect: connection refused
  Normal   Pulled     8m14s (x3 over 10m)   kubelet            Container image "docker.io/kubermatic/machine-controller:v1.24.4" already present on machine
  Normal   Created    8m13s (x4 over 11m)   kubelet            Created container machine-controller
  Normal   Started    8m13s (x4 over 11m)   kubelet            Started container machine-controller
  Warning  BackOff    62s (x30 over 9m27s)  kubelet            Back-off restarting failed container

{"level":"info","time":"2021-06-01T09:21:53.133Z","logger":"http-prober","caller":"http-prober/main.go:109","msg":"Probing","attempt":1,"max-attempts":100,"target":"https://apiserver-external.cluster-tsq85kvtfr.svc.cluster.local./healthz"}
{"level":"info","time":"2021-06-01T09:21:53.146Z","logger":"http-prober","caller":"http-prober/main.go:98","msg":"Hostname resolved","hostname":"apiserver-external.cluster-tsq85kvtfr.svc.cluster.local.","address":"10.99.157.188:443"}
{"level":"info","time":"2021-06-01T09:21:53.159Z","logger":"http-prober","caller":"http-prober/main.go:122","msg":"Endpoint is available"}
{"level":"info","time":"2021-06-01T09:21:53.242Z","logger":"http-prober","caller":"http-prober/main.go:129","msg":"All CRDs became available"}
I0601 09:21:53.381329       1 leaderelection.go:243] attempting to acquire leader lease  kube-system/machine-controller...
I0601 09:22:09.089050       1 leaderelection.go:253] successfully acquired lease kube-system/machine-controller
W0601 09:22:24.098933       1 warnings.go:67] apiextensions.k8s.io/v1beta1 CustomResourceDefinition is deprecated in v1.16+, unavailable in v1.22+; use apiextensions.k8s.io/v1 CustomResourceDefinition
W0601 09:22:24.110357       1 warnings.go:67] apiextensions.k8s.io/v1beta1 CustomResourceDefinition is deprecated in v1.16+, unavailable in v1.22+; use apiextensions.k8s.io/v1 CustomResourceDefinition
I0601 09:22:24.191440       1 migrations.go:175] CRD machines.machine.k8s.io not present, no migration needed
I0601 09:22:24.191520       1 migrations.go:54] Starting to migrate providerConfigs to providerSpecs
I0601 09:22:24.234968       1 migrations.go:136] Successfully migrated providerConfigs to providerSpecs
I0601 09:22:24.236644       1 plugin.go:95] looking for plugin "machine-controller-userdata-centos"
I0601 09:22:24.236836       1 plugin.go:123] checking "/usr/local/bin/machine-controller-userdata-centos"
I0601 09:22:24.237372       1 plugin.go:136] found '/usr/local/bin/machine-controller-userdata-centos'
I0601 09:22:24.237409       1 plugin.go:95] looking for plugin "machine-controller-userdata-coreos"
I0601 09:22:24.237454       1 plugin.go:123] checking "/usr/local/bin/machine-controller-userdata-coreos"
I0601 09:22:24.237510       1 plugin.go:136] found '/usr/local/bin/machine-controller-userdata-coreos'
I0601 09:22:24.237526       1 plugin.go:95] looking for plugin "machine-controller-userdata-ubuntu"
I0601 09:22:24.237559       1 plugin.go:123] checking "/usr/local/bin/machine-controller-userdata-ubuntu"
I0601 09:22:24.237597       1 plugin.go:136] found '/usr/local/bin/machine-controller-userdata-ubuntu'
I0601 09:22:24.237609       1 plugin.go:95] looking for plugin "machine-controller-userdata-sles"
I0601 09:22:24.237640       1 plugin.go:123] checking "/usr/local/bin/machine-controller-userdata-sles"
I0601 09:22:24.237695       1 plugin.go:136] found '/usr/local/bin/machine-controller-userdata-sles'
I0601 09:22:24.237729       1 plugin.go:95] looking for plugin "machine-controller-userdata-rhel"
I0601 09:22:24.237778       1 plugin.go:123] checking "/usr/local/bin/machine-controller-userdata-rhel"
I0601 09:22:24.237817       1 plugin.go:136] found '/usr/local/bin/machine-controller-userdata-rhel'
I0601 09:22:24.237830       1 plugin.go:95] looking for plugin "machine-controller-userdata-flatcar"
I0601 09:22:24.237867       1 plugin.go:123] checking "/usr/local/bin/machine-controller-userdata-flatcar"
I0601 09:22:24.237939       1 plugin.go:136] found '/usr/local/bin/machine-controller-userdata-flatcar'
I0601 09:22:24.238958       1 main.go:423] machine controller startup complete
I0601 09:22:24.340311       1 machineset_controller.go:148] Reconcile machineset cluster-2-worker-ck4rn5-645786bddf
I0601 09:22:24.340960       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-jvqvg, machine has no node ref
I0601 09:22:24.341108       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-7tl2d, machine has no node ref
I0601 09:22:24.341125       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-cl28s, machine has no node ref
I0601 09:22:24.341418       1 machineset_controller.go:148] Reconcile machineset cluster-2-worker-ck4rn5-645786bddf
I0601 09:22:24.341656       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-jvqvg, machine has no node ref
I0601 09:22:24.341757       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-7tl2d, machine has no node ref
I0601 09:22:24.341774       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-cl28s, machine has no node ref
I0601 09:22:24.342464       1 machineset_controller.go:148] Reconcile machineset cluster-2-worker-ck4rn5-645786bddf
I0601 09:22:24.342598       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-jvqvg, machine has no node ref
I0601 09:22:24.342637       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-7tl2d, machine has no node ref
I0601 09:22:24.342647       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-cl28s, machine has no node ref
I0601 09:22:24.342683       1 machineset_controller.go:148] Reconcile machineset cluster-2-worker-ck4rn5-645786bddf
I0601 09:22:24.342785       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-jvqvg, machine has no node ref
I0601 09:22:24.342809       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-7tl2d, machine has no node ref
I0601 09:22:24.342818       1 status.go:56] Unable to get node for machine cluster-2-worker-ck4rn5-645786bddf-cl28s, machine has no node ref
I0601 09:22:24.630353       1 machine_controller.go:675] Validated machine spec of cluster-2-worker-ck4rn5-645786bddf-cl28s
I0601 09:22:24.652443       1 machine_controller.go:675] Validated machine spec of cluster-2-worker-ck4rn5-645786bddf-jvqvg
I0601 09:22:24.674182       1 machine_controller.go:675] Validated machine spec of cluster-2-worker-ck4rn5-645786bddf-7tl2d
E0601 09:22:26.770451       1 runtime.go:78] Observed a panic: "invalid memory address or nil pointer dereference" (runtime error: invalid memory address or nil pointer dereference)
goroutine 389 [running]:
k8s.io/apimachinery/pkg/util/runtime.logPanic(0x2e9fac0, 0x5595020)
    k8s.io/apimachinery@v0.19.4/pkg/util/runtime/runtime.go:74 +0xa6
k8s.io/apimachinery/pkg/util/runtime.HandleCrash(0x0, 0x0, 0x0)
    k8s.io/apimachinery@v0.19.4/pkg/util/runtime/runtime.go:48 +0x89
panic(0x2e9fac0, 0x5595020)
    runtime/panic.go:969 +0x175
github.com/hetznercloud/hcloud-go/hcloud.(*ServerClient).Create(0xc0009302b0, 0x3a90a60, 0xc000116008, 0xc000c98ff0, 0x28, 0xc000ac2400, 0xc001204680, 0xc0002f0870, 0x1, 0x1, ...)
    github.com/hetznercloud/hcloud-go@v1.23.1/hcloud/server.go:306 +0x409
github.com/kubermatic/machine-controller/pkg/cloudprovider/provider/hetzner.(*provider).Create(0xc0002f1bc8, 0xc000d73200, 0xc000974f60, 0xc001212000, 0x35af, 0x0, 0x0, 0x0, 0x0)
    github.com/kubermatic/machine-controller/pkg/cloudprovider/provider/hetzner/provider.go:284 +0x8b8
github.com/kubermatic/machine-controller/pkg/cloudprovider.(*cachingValidationWrapper).Create(0xc000d66450, 0xc000d73200, 0xc000974f60, 0xc001212000, 0x35af, 0xc000aba2c0, 0x0, 0x0, 0x0)
    github.com/kubermatic/machine-controller/pkg/cloudprovider/validationwrapper.go:77 +0x5f
github.com/kubermatic/machine-controller/pkg/controller/machine.(*Reconciler).createProviderInstance(0xc00009cb60, 0x3ab8ea0, 0xc000d66450, 0xc000d73200, 0xc001212000, 0x35af, 0x0, 0x0, 0x0, 0x0)
    github.com/kubermatic/machine-controller/pkg/controller/machine/machine_controller.go:332 +0x137
github.com/kubermatic/machine-controller/pkg/controller/machine.(*Reconciler).ensureInstanceExistsForMachine(0xc00009cb60, 0x3a90ae0, 0xc000d6a600, 0x3ab8ea0, 0xc000d66450, 0xc000d73200, 0x3a31620, 0xc0008fb900, 0xc000139ea0, 0x0, ...)
    github.com/kubermatic/machine-controller/pkg/controller/machine/machine_controller.go:709 +0x89d
github.com/kubermatic/machine-controller/pkg/controller/machine.(*Reconciler).reconcile(0xc00009cb60, 0x3a90ae0, 0xc000d6a600, 0xc000d73200, 0x55f7740, 0xc000c98f30, 0x28)
    github.com/kubermatic/machine-controller/pkg/controller/machine/machine_controller.go:406 +0x7ac
github.com/kubermatic/machine-controller/pkg/controller/machine.(*Reconciler).Reconcile(0xc00009cb60, 0x3a90ae0, 0xc000d6a600, 0xc000c7f120, 0xb, 0xc000c98f30, 0x28, 0xc000d6a600, 0x40a3ff, 0xc00003a000, ...)
    github.com/kubermatic/machine-controller/pkg/controller/machine/machine_controller.go:360 +0x5e8
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler(0xc0003dfa40, 0x3a90a20, 0xc0007db540, 0x3038020, 0xc000ce53e0)
    sigs.k8s.io/controller-runtime@v0.7.0/pkg/internal/controller/controller.go:263 +0x317
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem(0xc0003dfa40, 0x3a90a20, 0xc0007db540, 0xc000069e00)
    sigs.k8s.io/controller-runtime@v0.7.0/pkg/internal/controller/controller.go:235 +0x205
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func1.1(0x3a90a20, 0xc0007db540)
    sigs.k8s.io/controller-runtime@v0.7.0/pkg/internal/controller/controller.go:198 +0x4a
k8s.io/apimachinery/pkg/util/wait.JitterUntilWithContext.func1()
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:185 +0x37
k8s.io/apimachinery/pkg/util/wait.BackoffUntil.func1(0xc000069f50)
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:155 +0x5f
k8s.io/apimachinery/pkg/util/wait.BackoffUntil(0xc000dc7f50, 0x3a37080, 0xc000d6a5d0, 0xc0007db501, 0xc0005e19e0)
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:156 +0xad
k8s.io/apimachinery/pkg/util/wait.JitterUntil(0xc000069f50, 0x3b9aca00, 0x0, 0x1, 0xc0005e19e0)
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:133 +0x98
k8s.io/apimachinery/pkg/util/wait.JitterUntilWithContext(0x3a90a20, 0xc0007db540, 0xc000dba0c0, 0x3b9aca00, 0x0, 0x1)
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:185 +0xa6
k8s.io/apimachinery/pkg/util/wait.UntilWithContext(0x3a90a20, 0xc0007db540, 0xc000dba0c0, 0x3b9aca00)
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:99 +0x57
created by sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func1
    sigs.k8s.io/controller-runtime@v0.7.0/pkg/internal/controller/controller.go:195 +0x4e7
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
    panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x22dca89]

goroutine 389 [running]:
k8s.io/apimachinery/pkg/util/runtime.HandleCrash(0x0, 0x0, 0x0)
    k8s.io/apimachinery@v0.19.4/pkg/util/runtime/runtime.go:55 +0x10c
panic(0x2e9fac0, 0x5595020)
    runtime/panic.go:969 +0x175
github.com/hetznercloud/hcloud-go/hcloud.(*ServerClient).Create(0xc0009302b0, 0x3a90a60, 0xc000116008, 0xc000c98ff0, 0x28, 0xc000ac2400, 0xc001204680, 0xc0002f0870, 0x1, 0x1, ...)
    github.com/hetznercloud/hcloud-go@v1.23.1/hcloud/server.go:306 +0x409
github.com/kubermatic/machine-controller/pkg/cloudprovider/provider/hetzner.(*provider).Create(0xc0002f1bc8, 0xc000d73200, 0xc000974f60, 0xc001212000, 0x35af, 0x0, 0x0, 0x0, 0x0)
    github.com/kubermatic/machine-controller/pkg/cloudprovider/provider/hetzner/provider.go:284 +0x8b8
github.com/kubermatic/machine-controller/pkg/cloudprovider.(*cachingValidationWrapper).Create(0xc000d66450, 0xc000d73200, 0xc000974f60, 0xc001212000, 0x35af, 0xc000aba2c0, 0x0, 0x0, 0x0)
    github.com/kubermatic/machine-controller/pkg/cloudprovider/validationwrapper.go:77 +0x5f
github.com/kubermatic/machine-controller/pkg/controller/machine.(*Reconciler).createProviderInstance(0xc00009cb60, 0x3ab8ea0, 0xc000d66450, 0xc000d73200, 0xc001212000, 0x35af, 0x0, 0x0, 0x0, 0x0)
    github.com/kubermatic/machine-controller/pkg/controller/machine/machine_controller.go:332 +0x137
github.com/kubermatic/machine-controller/pkg/controller/machine.(*Reconciler).ensureInstanceExistsForMachine(0xc00009cb60, 0x3a90ae0, 0xc000d6a600, 0x3ab8ea0, 0xc000d66450, 0xc000d73200, 0x3a31620, 0xc0008fb900, 0xc000139ea0, 0x0, ...)
    github.com/kubermatic/machine-controller/pkg/controller/machine/machine_controller.go:709 +0x89d
github.com/kubermatic/machine-controller/pkg/controller/machine.(*Reconciler).reconcile(0xc00009cb60, 0x3a90ae0, 0xc000d6a600, 0xc000d73200, 0x55f7740, 0xc000c98f30, 0x28)
    github.com/kubermatic/machine-controller/pkg/controller/machine/machine_controller.go:406 +0x7ac
github.com/kubermatic/machine-controller/pkg/controller/machine.(*Reconciler).Reconcile(0xc00009cb60, 0x3a90ae0, 0xc000d6a600, 0xc000c7f120, 0xb, 0xc000c98f30, 0x28, 0xc000d6a600, 0x40a3ff, 0xc00003a000, ...)
    github.com/kubermatic/machine-controller/pkg/controller/machine/machine_controller.go:360 +0x5e8
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler(0xc0003dfa40, 0x3a90a20, 0xc0007db540, 0x3038020, 0xc000ce53e0)
    sigs.k8s.io/controller-runtime@v0.7.0/pkg/internal/controller/controller.go:263 +0x317
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem(0xc0003dfa40, 0x3a90a20, 0xc0007db540, 0xc000069e00)
    sigs.k8s.io/controller-runtime@v0.7.0/pkg/internal/controller/controller.go:235 +0x205
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func1.1(0x3a90a20, 0xc0007db540)
    sigs.k8s.io/controller-runtime@v0.7.0/pkg/internal/controller/controller.go:198 +0x4a
k8s.io/apimachinery/pkg/util/wait.JitterUntilWithContext.func1()
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:185 +0x37
k8s.io/apimachinery/pkg/util/wait.BackoffUntil.func1(0xc000069f50)
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:155 +0x5f
k8s.io/apimachinery/pkg/util/wait.BackoffUntil(0xc000dc7f50, 0x3a37080, 0xc000d6a5d0, 0xc0007db501, 0xc0005e19e0)
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:156 +0xad
k8s.io/apimachinery/pkg/util/wait.JitterUntil(0xc000069f50, 0x3b9aca00, 0x0, 0x1, 0xc0005e19e0)
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:133 +0x98
k8s.io/apimachinery/pkg/util/wait.JitterUntilWithContext(0x3a90a20, 0xc0007db540, 0xc000dba0c0, 0x3b9aca00, 0x0, 0x1)
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:185 +0xa6
k8s.io/apimachinery/pkg/util/wait.UntilWithContext(0x3a90a20, 0xc0007db540, 0xc000dba0c0, 0x3b9aca00)
    k8s.io/apimachinery@v0.19.4/pkg/util/wait/wait.go:99 +0x57
created by sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func1
    sigs.k8s.io/controller-runtime@v0.7.0/pkg/internal/controller/controller.go:195 +0x4e7

kubermatic / machine-controller

nil pointer dereference on Hetzner cloud #987