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 ('40c9c4b011244ccdfc0df0aa4f7ff008', -1, 1503153755, 1503153755, '369c5c2e', 15, 0, 0)

Line : 189
File : sessions.php