diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc
index 52a2dedb67c..b7015b3d6ef 100644
--- a/sql/item_strfunc.cc
+++ b/sql/item_strfunc.cc
@@ -1187,7 +1187,7 @@ String *Item_func_substr_index::val_str(String *str)
       }
     }
     else
-    {					// Start counting at end
+    {
       /*
         Negative index, start counting at the end
       */
diff --git a/sql/sql_cache.cc b/sql/sql_cache.cc
index 366a13d59ba..2dd88f40005 100644
--- a/sql/sql_cache.cc
+++ b/sql/sql_cache.cc
@@ -762,7 +762,7 @@ void Query_cache::store_query(THD *thd, TABLE_LIST *tables_used)
   TABLE_COUNTER_TYPE local_tables;
   ulong tot_length;
   DBUG_ENTER("Query_cache::store_query");
-  if (query_cache_size == 0)
+  if (query_cache_size == 0 || thd->locked_tables)
     DBUG_VOID_RETURN;
   uint8 tables_type= 0;
 
@@ -921,8 +921,8 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length)
   bool check_tables;
   DBUG_ENTER("Query_cache::send_result_to_client");
 
-  if (query_cache_size == 0 || thd->variables.query_cache_type == 0)
-
+  if (query_cache_size == 0 || thd->locked_tables ||
+      thd->variables.query_cache_type == 0)
     goto err;
 
   /* Check that we haven't forgot to reset the query cache variables */