diff --git a/config/my.cnf b/config/my.cnf
index d360aa4..f5222c6 100644
--- a/config/my.cnf
+++ b/config/my.cnf
@@ -31,3 +31,4 @@ default-character-set=utf8mb4
 #default-character-set=utf8
 
 default-character-set=utf8mb4
+group_concat_max_len=-1