NullPointerException while calling KnowledgeRuntimeAdapter.update

Issue

When following code is called:

FactHandle handle = session.getFactHandle(activeAlarmValue);
        if (handle != null) {
            session.update(handle, activeAlarmValue);            
        }

This exception is raised:

org.drools.core.common.NamedEntryPoint.update(NamedEntryPoint.java:419)
        at org.drools.core.common.NamedEntryPoint.update(NamedEntryPoint.java:397)
        at org.drools.core.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1221)
        at org.drools.core.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1190)
        at org.drools.core.impl.StatefulKnowledgeSessionImpl.update(StatefulKnowledgeSessionImpl.java:326)
        at org.drools.impl.adapters.KnowledgeRuntimeAdapter.update(KnowledgeRuntimeAdapter.java:247)

The same code was working fine in the Drools 5, the exception started only after migration to BPM 6.x