diff -ur mysql-5.5.18.orig/sql-common/client.c mysql-5.5.18/sql-common/client.c
--- mysql-5.5.18.orig/sql-common/client.c	2011-11-21 18:06:36.895327989 +0100
+++ mysql-5.5.18/sql-common/client.c	2011-11-22 09:56:59.952963401 +0100
@@ -3666,10 +3666,10 @@
 static void mysql_prune_stmt_list(MYSQL *mysql)
 {
   LIST *element= mysql->stmts;
-  LIST *pruned_list= 0;
 
-  for (; element; element= element->next)
+  while (element)
   {
+    LIST *next= element->next;
     MYSQL_STMT *stmt= (MYSQL_STMT *) element->data;
     if (stmt->state != MYSQL_STMT_INIT_DONE)
     {
@@ -3677,14 +3677,10 @@
       stmt->last_errno= CR_SERVER_LOST;
       strmov(stmt->last_error, ER(CR_SERVER_LOST));
       strmov(stmt->sqlstate, unknown_sqlstate);
+      mysql->stmts= list_delete(mysql->stmts, element);
     }
-    else
-    {
-      pruned_list= list_add(pruned_list, element);
-    }
+    element= next;
   }
-
-  mysql->stmts= pruned_list;
 }