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 ('4d2900b522ccf9f9fe92b4abf6c21bc3', -1, 1526975017, 1526975017, '36c45659', 15, 0, 0)

Line : 187
File : sessions.php