how to solve this
I also believe something is wrong with your database configuration see
https://bugs.mysql.com/bug.php?id=18551
Well,
if I remember correctly, you suggested to change database column types from int to char some days ago. Crashes like that are supposed to happen as a result.
Please report issue on github , it seems due to strict rules of your Database server.
https://github.com/opensource-socialnetwork/opensource-socialnetwork/issues/new
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