diff --git a/Pilz.Cryptography/UniquieID.cs b/Pilz.Cryptography/UniquieID.cs
index ff7ee07..5437b1f 100644
--- a/Pilz.Cryptography/UniquieID.cs
+++ b/Pilz.Cryptography/UniquieID.cs
@@ -91,8 +91,13 @@ namespace Pilz.Cryptography
         public override bool Equals(object obj)
         {
             var iD = obj as UniquieID<TargetType>;
-            return iD != null &&
-                   _iD.Equals(iD._iD);
+            var leftHasID = (iD?.HasID ?? false);
+            var rightHasID = HasID;
+
+            if (leftHasID && rightHasID)
+                return _iD.Equals(iD._iD);
+            else
+                return false;
         }
 
         public override int GetHashCode()
@@ -104,7 +109,7 @@ namespace Pilz.Cryptography
         public static implicit operator UniquieID<TargetType>(string id)    => new UniquieID<TargetType>() { ID = id };
         public static implicit operator UniquieID<TargetType>(int id)       => new UniquieID<TargetType>() { ID = Convert.ToString(id) };
 
-        public static bool operator ==(UniquieID<TargetType> left, UniquieID<TargetType> right) => left.ID == right.ID;
-        public static bool operator !=(UniquieID<TargetType> left, UniquieID<TargetType> right) => left.ID != right.ID;
+        public static bool operator ==(UniquieID<TargetType> left, UniquieID<TargetType> right) => left.ID.Equals(right.ID);
+        public static bool operator !=(UniquieID<TargetType> left, UniquieID<TargetType> right) => !left.ID.Equals(right.ID);
     }
 }