Update to polls 1.7.4 failed

Update of polls to version 1.7.4 fails with the following message:

`Doctrine\DBAL\Exception\DriverException: An exception occurred while executing ‘ALTER TABLE oc_polls_polls ADD option_limit INT DEFAULT 0 NOT NULL’:

SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
Update failed`

Polls had to be disabled from command line and removed. New installations fail with the same error. Any idea where to look?

The main reason for SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
Update failed` is reported because of a timeout, which is defaulted to 30 seconds. Mut it would be strange, if the migrations would take that time.

Indeed, I am not even sure if the update took that long before it failed. How can I increase the timeout (temporarily, permanently) for confirming or ruling out your diagnose? Sorry for the noob question…