Don't allow closing after close

WebSocket.lua

@@ -19,6 +19,7 @@ local function notEmpty(s)
 end
 
 local ws = function (dict)
+	local closed = false
 	local onMessage = dict.onMessage or function(msg)
 		print(msg)
 	end
@@ -41,17 +42,13 @@ local ws = function (dict)
 			})
 			if not resp.Success then
 				error("Error Sending Message: " .. resp.StatusCode .. " " .. resp.StatusMessage)
+				return false
+			else
+				return true
 			end
 		end
 
-		local function close()
-			server:RequestAsync({
-				["Url"] = BaseUrl .. "/api/close/" .. JobId .. "/" .. id,
-				["Method"] = "DELETE"
-			})
-		end
-
-		local loop = coroutine.create(function()
+		local loop = task.spawn(function()
 			while wait(0.1) do 
 				print("poll")
 				local response = server:RequestAsync({
@@ -72,7 +69,17 @@ local ws = function (dict)
 				end
 			end
 		end)
-		coroutine.resume(loop)
+		
+		local function close()
+			if closed then return end
+			closed = true
+			server:RequestAsync({
+				["Url"] = BaseUrl .. "/api/close/" .. JobId .. "/" .. id,
+				["Method"] = "DELETE"
+			})
+			task.cancel(loop)
+		end
+		
 		game:BindToClose(close)
 		return {
 			sendMessage = sendMessage,