Event Manager fixes

Runtime/EventManager.cs

@@ -28,19 +28,52 @@ namespace Utils
             OnLateUpdated?.Invoke();
         }
 
-        public int UpdateLength()
+        public int UpdateLength
         {
-            return (int)OnUpdated?.GetInvocationList().Length;
+            get
+            {
+                var list = OnUpdated?.GetInvocationList();
+                if (list != null)
+                {
+                    return list.Length;
+                }
+                else
+                {
+                    return 0;
+                }
+            }
         }
 
-        public int FixedUpdateLength()
+        public int FixedUpdateLength
         {
-            return (int)OnFixedUpdated?.GetInvocationList().Length;
+            get
+            {
+                var list = OnFixedUpdated?.GetInvocationList();
+                if (list != null)
+                {
+                    return list.Length;
+                }
+                else
+                {
+                    return 0;
+                }
+            }
         }
 
-        public int LateUpdateLength()
+        public int LateUpdateLength
         {
-            return (int)OnLateUpdated?.GetInvocationList().Length;
+            get
+            {
+                var list = OnLateUpdated?.GetInvocationList();
+                if (list != null)
+                {
+                    return list.Length;
+                }
+                else
+                {
+                    return 0;
+                }
+            }
         }
     }
 }