[FritzBoxTR064]: FritzBox 6591 cannot be reached, log shows errors

I've initially installed a FB7390, using the settings suggested and a dedicated user account on the FB worked well. When my new FB6591 arrived, I cloned the settings to the new device, which can be reached under the same IP. Settings were not changed.

Expected Behavior

Current Behavior

The installed items show no data, the log shows the following message on every call:

java.lang.NullPointerException: null
    at org.openhab.binding.fritzboxtr064.internal.FritzboxTr064Binding.execute(FritzboxTr064Binding.java:219) ~[?:?]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) ~[225:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [225:org.openhab.core.compat1x:2.4.0]
2019-07-18 22:43:34.858 [WARN ] [ing.fritzboxtr064.internal.Tr064Comm] - No tr064 service found for service id urn:LanDeviceHosts-com:serviceId:Hosts1
2019-07-18 22:43:34.858 [WARN ] [ing.fritzboxtr064.internal.Tr064Comm] - Error constructing request SOAP msg for getting parameter. null
2019-07-18 22:43:34.859 [WARN ] [ing.fritzboxtr064.internal.Tr064Comm] - Could not determine data to be sent to FritzBox!
2019-07-18 22:43:34.859 [ERROR] [b.core.service.AbstractActiveService] - Error while executing background thread FritzboxTr064 Refresh Service
java.lang.NullPointerException: null
    at org.openhab.binding.fritzboxtr064.internal.FritzboxTr064Binding.execute(FritzboxTr064Binding.java:219) ~[?:?]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) ~[225:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [225:org.openhab.core.compat1x:2.4.0]
2019-07-18 22:43:35.887 [INFO ] [messageLogger                       ] - C->B PINGREQ <milight-hub-3929577>
2019-07-18 22:43:35.887 [INFO ] [messageLogger                       ] - C<-B PINGRESP <milight-hub-3929577>
2019-07-18 22:43:39.861 [WARN ] [ing.fritzboxtr064.internal.Tr064Comm] - No tr064 service found for service id urn:LanDeviceHosts-com:serviceId:Hosts1
2019-07-18 22:43:39.863 [WARN ] [ing.fritzboxtr064.internal.Tr064Comm] - Error constructing request SOAP msg for getting parameter. null
2019-07-18 22:43:39.864 [WARN ] [ing.fritzboxtr064.internal.Tr064Comm] - Could not determine data to be sent to FritzBox!
2019-07-18 22:43:39.864 [ERROR] [b.core.service.AbstractActiveService] - Error while executing background thread FritzboxTr064 Refresh Service
java.lang.NullPointerException: null
    at org.openhab.binding.fritzboxtr064.internal.FritzboxTr064Binding.execute(FritzboxTr064Binding.java:219) ~[?:?]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) ~[225:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [225:org.openhab.core.compat1x:2.4.0]

Possible Solution

Steps to Reproduce (for bugs)

1. 2. 3. 4.

Context

Your Environment

openhab 2.4.0 running in a docker container on a windows host.

openhab / openhab1-addons