My first thought on reading the error is that there might be some corrupted data in the database, having a NULL where it is expected to have a value and it's colliding with a table constraint.
After a quick research, I read that empty strings are treated as a NULL value by Oracle DBMS, so that might have something to do with the error.
There's a KB article on how to fix a quite similar error here:
Also have a look at:
specially the part about database drivers.
Anyway, the research on this particular issue probably needs a deep research, diving into your logs.
If you finally fix it, please, add the correct answer here so that other users experiencing the same issue can benefit from it.
Regards and good luck!
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