diff --git a/Scripts/Node.cs b/Scripts/Node.cs
index e22b78f..9cc7bb3 100644
--- a/Scripts/Node.cs
+++ b/Scripts/Node.cs
@@ -84,6 +84,14 @@ namespace XNode {
             port.ClearConnections();
             ports.Remove(port.fieldName);
         }
+
+        /// <summary> Removes all instance ports from the node </summary>
+        [ContextMenu("Clear instance ports")]
+        public void ClearInstancePorts() {
+            foreach (NodePort port in InstancePorts) {
+                RemoveInstancePort(port);
+            }
+        }
 #endregion
 
 #region Ports
@@ -229,7 +237,7 @@ namespace XNode {
                 this.Clear();
 
                 if (keys.Count != values.Count)
-                    throw new System.Exception(string.Format("there are {0} keys and {1} values after deserialization. Make sure that both key and value types are serializable."));
+                    throw new System.Exception("there are " + keys.Count + " keys and " + values.Count + " values after deserialization. Make sure that both key and value types are serializable.");
 
                 for (int i = 0; i < keys.Count; i++)
                     this.Add(keys[i], values[i]);