Error while closing context while sending larger userlist

[org.flowable.common.engine.impl.interceptor.CommandContext] [125] [ERROR] [https-openssl-nio-9555-exec-5] Error while closing command context
flowable-engine | java.lang.NullPointerException: null
flowable-engine | at org.flowable.common.engine.impl.persistence.entity.AbstractEntityManager.create(AbstractEntityManager.java:47)
flowable-engine | at org.flowable.common.engine.impl.persistence.entity.ByteArrayRef.setBytes(ByteArrayRef.java:102)
flowable-engine | at org.flowable.common.engine.impl.persistence.entity.ByteArrayRef.setValue(ByteArrayRef.java:80)
flowable-engine | at org.flowable.variable.service.impl.persistence.entity.VariableInstanceEntityImpl.setBytes(VariableInstanceEntityImpl.java:115)
flowable-engine | at org.flowable.variable.service.impl.types.JsonType.setValue(JsonType.java:124)
flowable-engine | at org.flowable.variable.service.impl.persistence.entity.VariableInstanceEntityImpl.setValue(VariableInstanceEntityImpl.java:141)
flowable-engine | at org.flowable.variable.service.impl.persistence.entity.VariableScopeImpl.createVariableInstance(VariableScopeImpl.java:906)
flowable-engine | at org.flowable.engine.impl.persistence.entity.ExecutionEntityImpl.createVariableInstance(ExecutionEntityImpl.java:839)
flowable-engine | at org.flowable.engine.impl.persistence.entity.ExecutionEntityImpl.createVariableLocal(ExecutionEntityImpl.java:865)
flowable-engine | at org.flowable.engine.impl.persistence.entity.ExecutionEntityImpl.setVariable(ExecutionEntityImpl.java:739)
flowable-engine | at org.flowable.engine.impl.persistence.entity.ExecutionEntityImpl.setVariable(ExecutionEntityImpl.java:702)
flowable-engine | at org.flowable.variable.service.impl.persistence.entity.VariableScopeImpl.setVariable(VariableScopeImpl.java:659)