phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1114 The table 'phpbb_sessions' is full

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('69a859dd8b7d8f7af9f3ce8033681dfc', -1, 1519460012, 1519460012, '365acab8', -2, 0, 0)

Line : 187
File : sessions.php