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 ('7cc69b7f3ad1a0ba9c794ce3c8c6559e', -1, 1534281638, 1534281638, '36c67e6e', -4, 0, 0)

Line : 187
File : sessions.php