diff --git a/MotorBoat/MotorBoat/BoatGenericCollection.cs b/MotorBoat/MotorBoat/BoatGenericCollection.cs
index 3ea5a6c..55440ec 100644
--- a/MotorBoat/MotorBoat/BoatGenericCollection.cs
+++ b/MotorBoat/MotorBoat/BoatGenericCollection.cs
@@ -67,7 +67,7 @@ namespace MotorBoat.Generics
         /// <returns></returns>
         public static bool operator +(BoatsGenericCollection<T, U> collect, T? obj)
         {
-            if (obj == null || collect == null)
+            if (obj != null && collect != null)
             {
                 collect._collection.Insert(obj);
                 return true;
@@ -83,7 +83,7 @@ namespace MotorBoat.Generics
         /// <returns></returns>
         public static T? operator -(BoatsGenericCollection<T, U>? collect, int pos)
         {
-            T? obj = collect._collection[pos];
+            T? obj = collect?._collection[pos];
             if (obj != null && collect != null)
             {
                 collect._collection.Remove(pos);