Updating voicemail module to 15.0.18.41, crashing systems with large amounts of voicemails

Just had this happen again. Updated a server, it adds:
externnotify=/usr/sbin/fwconsole voicemail
And causes the system to send thousands of emails at once out to users. For old voicemails. It basically locks up the server because it spawns hundreds of php processes like this:
asterisk 2746 0.1 1.2 507860 22608 ? D 13:27 0:00 php /usr/sbin/fwconsole voicemail [email protected] 17 8 0

Took me 45 mins to login and kill -9 pidof php and then edit the voicemail.com and remove the line.

EDIT: Okay, found it, it’s the update to the voicemail module:
**15.0.18.41:** FREEI-1520 External notify field not being populated automatically in Voicemail admin

Had another update I guess cause the same issue. externnotify got set again to use fwconsole, and system locked on apply changes, had to crawl my way in and kill -9 pidof php.

How do I stop this from happening?