Hi there!
First thing is, when that error happens, press F12 or F8, a browser window will open. Then, go to the CONSOLE tab, and send me a screenshot of what is in there.
Now, if you manage to make other stats to work correctly, then it is not a compatibility problem I guess. So, send me a screenshot of that specific stat that is causing the trouble and also a screenshot of how are you trying to raise/change the value of that stat.
then we see what we can do about that :)