Geeting a syntax error in Browser Console

[Hippopotamus]

Hello,

I am on Firefox 54.0a2 (2017-03-20), Greasemonkey 3.10beta1 and WAR 1.3.7.2. I get the following error in the Browser Console:



Would be great if you could look into this. Thanks.

[mental]

Sorry no idea what is causing the error, as long as the script is working I'm not too worried about it.