Added an assertion with an detailed error message to debug an error in the action button code.

ActionButton.lua

@@ -265,6 +265,7 @@ end
 function Button:RefreshStateAction(state)
 	local state = tonumber(state or self:GetAttribute("state")) or 0
 	local action = self.stateactions[state]
+	assert(action, ("No valid action for state %d on button %d of Bar %d"):format(state, self.rid, self.parent.id))
 	self:SetAttribute("action-"..state, action)
 
 	if action > 120 and action <= 126 then

Bar.lua

@@ -380,7 +380,7 @@ function Bar:ControlFadeOut()
 			fade = min(max(fade, 0), 100) / 100
 			self:SetAlpha(fade)
 		else
-			self:SetAlpha(self.config.fadeoutalpha)
+			self:SetAlpha(self.config.fadeoutalpha or 0)
 		end
 		self.faded = true
 	end