pcall in the callback tracker

monarch/utils/callback_tracker.lua

@@ -7,15 +7,20 @@ function M.create()
 	local callback = nil
 	local callback_count = 0
 
+	local function invoke_if_done()
+		if callback_count == 0 and callback then
+			local ok, err = pcall(callback)
+			if not ok then print(err) end
+		end
+	end
+
 	--- Create a callback function and track when it is done
 	-- @return Callback function
 	function instance.track()
 		callback_count = callback_count + 1
 		return function()
 			callback_count = callback_count - 1
-			if callback_count == 0 and callback then
+			invoke_if_done()
-				callback()
-			end
 		end
 	end
 
@@ -23,9 +28,7 @@ function M.create()
 	-- @param cb Function to call when all 
 	function instance.when_done(cb)
 		callback = cb
-		if callback_count == 0 then
+		invoke_if_done()
-			callback()
-		end
 	end
 
 	return instance