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MySQL error code

MySQL error 6008

MySQL server error 6008 is ER_NULL_CANT_BE_PERSISTED_FOR_READONLY, reported with SQLSTATE HY000.

Trying to persist a NULL into a variable '%s' that's settable only on command line is not supported
Error6008
NameER_NULL_CANT_BE_PERSISTED_FOR_READONLY
SQLSTATEHY000
GroupServer errors

Source: MySQL 8.4 Error Reference