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 ('53a899dc5d87830d5ef3a66d9f06c4f0', -1, 1526878363, 1526878363, '369f55c1', -1, 0, 0)

Line : 187
File : sessions.php