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 ('b03d0d39f184e4c37ebdc7ca72c8a3da', -1, 1511481949, 1511481949, '36923250', -4, 0, 0)

Line : 187
File : sessions.php