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 ('fb3b918ec8e9f63b45c2a6845bd0bd27', -1, 1506054425, 1506054425, '36c6a54a', 18, 0, 0)

Line : 187
File : sessions.php