diff -Naru ./mysql-5.1.37/sql/sql_select.cc ./mysql-5.1.37-bug34660/sql/sql_select.cc
--- ./mysql-5.1.37/sql/sql_select.cc	2009-07-14 08:12:07.000000000 +0900
+++ ./mysql-5.1.37-bug34660/sql/sql_select.cc	2009-08-06 23:07:02.000000000 +0900
@@ -2514,6 +2514,7 @@
     error= table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
     if (error)
     {
+      join->tables=0;
       table->file->print_error(error, MYF(0));
       goto error;
     }