Transport Slicing Integration: null pointer exception in saving SDNC rollback data

2020-10-15T19:19:08.738Z||org.camunda.bpm.engine.context - ENGINE-16006 BPMN Stack Trace:
Activity_16luyg1 (activity-execute, ProcessInstance[418aeff5-0f1b-11eb-8d20-0242ac12001a])
Activity_16luyg1, name=Postprocess SDNC Allocate TN NSSI Request
^

WorkflowExceptionTriggerTask_1
^

Activity_1fs2182, name=Call SDNC Adapter: Allocate TN NSSI
^

endEventFlow, name=End Event Flow
^

toggleSuccessIndicator, name=Toggle Success Indicator
^

ResetInterimNotificationFlag, name=Reset Interim Notification Flag

^

ExclusiveGateway_1, name=Check final indicator
^

timeoutError, name=Did Timeout occur?
^

returnWorkflowResult, name=Return workflow result
^

SubProcess, name=Wait for asynchronous message

2020-10-15T19:19:08.743Z||org.camunda.bpm.engine.context - ENGINE-16004 Exception while closing command context: Unable to evaluate script while executing activity 'Activity_16luyg1' in the process definition with id 'DoCreateTnNssiInstance:8:d1091c6e-0e5b-11eb-83e1-0242ac120019': java.lang.NullPointerException: Cannot invoke method put() on null object
org.camunda.bpm.engine.ScriptEvaluationException: Unable to evaluate script while executing activity 'Activity_16luyg1' in the process definition with id 'DoCreateTnNssiInstance:8:d1091c6e-0e5b-11eb-83e1-0242ac120019': java.lang.NullPointerException: Cannot invoke method put() on null object
at org.camunda.bpm.engine.impl.scripting.CompiledExecutableScript.evaluate(CompiledExecutableScript.java:60)
at org.camunda.bpm.engine.impl.scripting.SourceExecutableScript.evaluate(SourceExecutableScript.java:60)
at org.camunda.bpm.engine.impl.scripting.ExecutableScript.execute(ExecutableScript.java:62)