We have a problem with the upgrade of the Hotpotatoes plugin on our Moodle (2.7). When we upgrade the plugin, Moodle crashes (see the screenshot below) and we have no other choice than delete the plugin file in the ftp server. The weird thing is that we upgraded the same plugin on our Moodle test and it works perfectly (both Moodle are exactly the same). We tried it with the last three versions and everytime it's the same thing : on the test Moodle, it works and it doesn't on the other site.
The only difference between the two Moodle is the version of php :
Moodle test : 5.6
The other one : 5.4
Can it be the reason ?
I hope my question is quite clear...
Thank you in advance,