diff -ur php-gtk/ext/gtk+/gtk-2.10.overrides php-gtk2/ext/gtk+/gtk-2.10.overrides
--- php-gtk/ext/gtk+/gtk-2.10.overrides	2007-10-18 10:20:23.000000000 -0400
+++ php-gtk2/ext/gtk+/gtk-2.10.overrides	2007-10-20 20:21:41.000000000 -0400
@@ -431,9 +431,13 @@
         NULL TSRMLS_CC
     );
 
-    convert_to_long(retval);
-    status = Z_LVAL_P(retval);
-    zval_ptr_dtor(&retval);
+    if(retval) {
+       convert_to_long(retval);
+       status = Z_LVAL_P(retval);
+       zval_ptr_dtor(&retval);
+    } else {
+       status = 0;
+    }
 
     phpg_handle_marshaller_exception(TSRMLS_C);