Gamemaker Server crashes upon compile

Hallöle.

I apologize if this is not the right place to ask/report/whatever this, but i have a little problem:
I've been working on a game for about 2 years now and since a few months ago (maybe even a year ago, lol) i've added an online support on it via this extension. Everything's been working fine and like supposed to, but since yesterday, i've been experiencing a weird bug. Whenever the extension is installed and i try to test my game, it gives me this weird crash message which i've never ever seen before:

___________________________________________
COMPILATION ERROR in extension package GameMaker Server+
Error in code at line 55:
var d;
^
at position 19: Variable name expected.


It just randomly happened. I even removed all instances from the game which use GMS and even removed the game from this server, but it still occurs. I have no idea what causes it.
Any help would be appreciated.