3465193 - Error message in Backoffice while Datahub is restarting - SAP Commerce Cloud

While Datahub restarts, the following error appears in Backoffice:
There was a problem sending the request to the Data Hub server. Please check the logs.

The following logs can also be found:
"level":"ERROR",
"loggerName":"com.hybris.cockpitng.engine.impl.DefaultCockpitWidgetEngine",
"message":"Could not create widget view",
"thrown":{
    "message":"Cannot invoke \"de.hybris.platform.servicelayer.user.UserService.isMemberOfGroup(de.hybris.platform.core.model.user.UserModel, de.hybris.platform.core.model.user.UserGroupModel)\" because \"this.userService\" is null",
    "name":"java.lang.NullPointerException",
    "extendedStackTrace":[
        {"class":"de.hybris.platform.datahubbackoffice.service.datahub.impl.UserContextImpl","method":"isMemberOf","file":"UserContextImpl.java","line":59,"exact":false,"location":"?","version":"?"},
        ...

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

SAP Commerce Cloud

KBA , CEC-SCC-CDM-BO-FRW , Framework , Problem