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 ('00f009ede51fa9f5da3f7bb01a0d66cb', -1, 1508488640, 1508488640, '36e0c5fb', -4, 0, 0)

Line : 187
File : sessions.php