[Bug Report]: k8sgpt serve panic: runtime error: invalid memory address or nil pointer dereference

Checklist

[X] I've searched for similar issues and couldn't find anything matching
[X] I've included steps to reproduce the behavior

Affected Components

[X] K8sGPT (CLI)
[ ] K8sGPT Operator

K8sGPT Version

0.3.37

Kubernetes Version

1.28.0

Host OS and its Version

No response

Steps to reproduce

With a default configuration (/Users//Library/Application Support/k8sgpt/k8sgpt.yaml) including multiple specific backends, neither of which is OpenAI
Run k8sgpt serve

Expected behaviour

Descriptive error for missing --backend flag with non-default (openai) backend configurations.

Actual behaviour

k8sgpt serve panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x2 addr=0x8 pc=0x102e297e0]

goroutine 1 [running]: github.com/k8sgpt-ai/k8sgpt/cmd/serve.init.func1(0x140001dce00?, {0x102e2d786?, 0x4?, 0x102e2d78a?}) github.com/k8sgpt-ai/k8sgpt/cmd/serve/serve.go:152 +0x500 github.com/spf13/cobra.(Command).execute(0x105b5b380, {0x105d9d388, 0x0, 0x0}) github.com/spf13/cobra@v1.8.0/command.go:987 +0x828 github.com/spf13/cobra.(Command).ExecuteC(0x105b57160) github.com/spf13/cobra@v1.8.0/command.go:1115 +0x344 github.com/spf13/cobra.(*Command).Execute(...) github.com/spf13/cobra@v1.8.0/command.go:1039 github.com/k8sgpt-ai/k8sgpt/cmd.Execute({0x1036baa18?, 0x0?}, {0x1036bde88?, 0x100c567c0?}, {0x1036bdf70?, 0x140000021c0?}) github.com/k8sgpt-ai/k8sgpt/cmd/root.go:59 +0xa0 main.main() github.com/k8sgpt-ai/k8sgpt/main.go:25 +0x4c

Additional Information

configuration:

ai:
    providers:
        - name: localai
          model: llama3
          baseurl: http://localhost:11434/v1
          temperature: 0.7
          topp: 0.5
          topk: 50
          maxtokens: 2048
        - name: amazonbedrock
          model: anthropic.claude-v2:0
          temperature: 0.7
          providerregion: us-east-1
          topp: 0.5
          topk: 50
          maxtokens: 2048
    defaultprovider: ""
kubeconfig: ""
kubecontext: ""

k8sgpt-ai / docs