XF 2.2 The table 'xf_conversation_message' is full

When I do mysqldump backup, I always test locally the dump is actually valid by creating a new db and testing the import works, then drop after

when trying to import mysqldump I get The table 'xf_conversation_message' is full
The table 'xf_conversation_user' is full

Why would a table ever be full if disk space have enough available?

how to fix this issue? I read this but not sure is something safe to try : https://xenforo.com/community/threads/how-i-purged-old-conversations-in-database.212528/

thanks for the help!
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