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 ('e9ba94fb0d1c69ba5edb4b2ae53f0846', -1, 1508488898, 1508488898, '36e0c5fb', -4, 0, 0)

Line : 187
File : sessions.php