Could you add :WaitForChild() in Icon module?
I recently started to have errors when LocalScript running in ReplicatedFirst is waiting for Icon, but in the time of requiring other sub-modules aren’t present yet:
I already did fixed some of them and I forgot to take a proof of the error, but it seems I didn’t cover everything so here is the proof. (For example I edited iconModule.IconController to iconModule:WaitForChild("IconController").) I also think others could use this update, too, instead of just fixing it localy in my place.