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 ('325f7f9a477190a19be97f2d6f92b9ff', -1, 1526878539, 1526878539, '369f55c1', 18, 0, 0)

Line : 187
File : sessions.php