ULX Spamming My Server Console

A server of mine running DarkRP 2.3.7 and ULX 3.4 (downloaded from the site) is spamming the below in the console, what is this, should I be worried? Seems to only come up when people are connected, admins or not.

Timer Error: ULib/server/hook.lua:139: attempt to index local 'gm' (a number value)

Thats a RP problem ULX has with DarkRP. Try a older
ewer version of it and see what happeneds.

Of what? DarkRP or ULX?

ULX has the problem with DarkRP.