diff --git a/gstreamer-sharp/Element.custom b/gstreamer-sharp/Element.custom
index 762b92a8a7..a7d18c9b37 100644
--- a/gstreamer-sharp/Element.custom
+++ b/gstreamer-sharp/Element.custom
@@ -54,6 +54,9 @@ private class PadEnumerable : IEnumerable {
       IntPtr raw_ret;
       bool retry = false;
 
+      if (iterator == IntPtr.Zero)
+        return false;
+
       do {
         int ret = gst_iterator_next (iterator, out raw_ret);
         switch (ret) {
@@ -82,7 +85,8 @@ private class PadEnumerable : IEnumerable {
 
     public void Reset () {
       seen.Clear ();
-      gst_iterator_resync (iterator);
+      if (iterator != IntPtr.Zero)
+        gst_iterator_resync (iterator);
     }
 
     public PadEnumerator (IntPtr iterator) {
@@ -103,7 +107,8 @@ private class PadEnumerable : IEnumerable {
   }
 
   ~PadEnumerable () {
-    gst_iterator_free (iterator);
+    if (iterator != IntPtr.Zero)
+      gst_iterator_free (iterator);
   }
 }