Appears to be a MySQL server configuration, according to this answer:
I have encountered this a number of times and I've normally found the answer to be a very low default setting of max_allowed_packet .
Raising it in /etc/my.cnf (under [mysqld] ) to 8 or 16M usually fixes it. (The default in MySql 5.7 is 4194304 , which is 4MB.)
[mysqld]
max_allowed_packet=16M
Note: Just create the line if it does not exist, it must appear as an entry underneath [mysqld]
Note: This can be set on your server as it's running but it will be lost after the mysql daemon is restarted. Use SET GLOBAL max_allowed_packet=104857600 (this sets it to 100MB)
Note: On Windows you may need to save your my.ini or my.cnf file with ANSI not UTF-8 encoding.
Source: stackOverflow.
