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 ('4270b5f55f0fc6ce592dd9d6f9dbdb81', -1, 1503469241, 1503469241, '36c6231a', -4, 0, 0)

Line : 189
File : sessions.php