Error querying database. Cause: org.flowable.common.engine.api.FlowableException: unknown variable type name String

1

I have a strange error.
In the table ACT_RU_VARIABLE one row is having TYPE_ String instead of string .
How did this get added to the ACT_RU_VARIABLE ?

org.apache.ibatis.exceptions.PersistenceException:

Error querying database. Cause: org.flowable.common.engine.api.FlowableException: unknown variable type name String

Cause: org.flowable.common.engine.api.FlowableException: unknown variable type name String

    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30) ~
2

Looking at the code, this indeed can only be lowercase: https://github.com/flowable/flowable-engine/blob/master/modules/flowable-variable-service/src/main/java/org/flowable/variable/service/impl/types/StringType.java#L23

Not sure how it is possible you got a different value there. Afaics, nothing in the engine changes that type. Is it a one-time thing? Or can you reproduce it?