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 ('6fb7ac2a07a2b21bb170fe78ed489dfd', -1, 1508488331, 1508488331, '36e0c5fb', -1, 0, 0)

Line : 187
File : sessions.php