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 ('b2f6c2bcec0c1ceeb14b4f6ae5d53dc8', -1, 1540031395, 1540031395, '36a174e1', 4, 0, 0)

Line : 187
File : sessions.php