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 ('3e288c369c1ab6c73c6cc02f1991e2ac', -1, 1513176909, 1513176909, '36a33d42', -4, 0, 0)

Line : 187
File : sessions.php