MariaDB: ERROR 2006 (HY000): MySQL server has gone away

When i try to execute a query i got error: MariaDB [suitecrm]> select * from waiter_log; ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... An error does not occur every time: MariaDB [suitecrm]> select count(*) from waiter_log; ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 64418348 Current database: suitecrm +----------+ | count(*) | +----------+ | 893 | +----------+ 1 row in set (2.13 sec) MariaDB [suitecrm]> select count(*) from waiter_log; +----------+ | count(*) | +----------+ | 893 | +----------+ 1 row in set (0.00 sec) ***/etc/my.cnf*** max_allowed_packet = 128M interactive_timeout=20 wait_timeout=20 Ver 15.1 Distrib 5.5.64-MariaDB, for Linux (x86_64) using readline 5.1