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 ('423d4faf33ae212be0b7682dc70583f4', -1, 1506015189, 1506015189, '6b1676f2', 4, 0, 0)

Line : 187
File : sessions.php