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-rw-r--r--sql/item_sum.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index 30cbe872101..ad8ebd0791c 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -3406,7 +3406,7 @@ String* Item_func_group_concat::val_str(String* str)
DBUG_ASSERT(fixed == 1);
if (null_value)
return 0;
- if (!result.length() && tree)
+ if (no_appended && tree)
/* Tree is used for sorting as in ORDER BY */
tree_walk(tree, (tree_walk_action)&dump_leaf_key, (void*)this,
left_root_right);