Steps to reproduce the issue

if akeeba backup is installed and the plugin "backup on update" is published, often, the update process is stopped with the message:

"The most recent request was denied because it contained an invalid security token. Please refresh the page and try again."

If one tries the update again, again a backup is made and the update process is stopped with the same message. The Joomla! update is only works when the plugin "backup on update" is disabled.

Expected result

Joomla! update to 3.6.2 + backup beforehand.

Actual result

stop's after the backup.

System information (as much as possible)

update from Joomla! 3.6.0 to 3.6.1 or to 3.6.2 with akeeba backup installed & the plugin "backup on update" enabled.

Additional comments

the plugin "backup on update" could check if a backup was made in the last hour, instead of continually making new backups and stopping the Joomla! update.