=== modified file 'libmysqld/lib_sql.cc'
--- a/libmysqld/lib_sql.cc	2008-06-18 16:17:15 +0000
+++ b/libmysqld/lib_sql.cc	2008-08-13 18:50:08 +0000
@@ -1103,6 +1103,9 @@
   data->embedded_info->prev_ptr= &cur->next;
   next_field=cur->data;
   next_mysql_field= data->embedded_info->fields_list;
+#ifndef DBUG_OFF
+  field_pos= 0;
+#endif
 
   DBUG_VOID_RETURN;
 }