diff --git a/config/mysql/conf.d/onlyoffice.cnf b/config/mysql/conf.d/onlyoffice.cnf
index 79abc23..44f9c0b 100644
--- a/config/mysql/conf.d/onlyoffice.cnf
+++ b/config/mysql/conf.d/onlyoffice.cnf
@@ -2,3 +2,6 @@
 sql_mode = 'NO_ENGINE_SUBSTITUTION'
 max_connections = 1000
 max_allowed_packet = 1048576000
+group_concat_max_len = 2048
+log-error = /var/log/mysql/error.log
+