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 ('a9ecc0dcc8a23f5259d5e5f7b2df17a7', -1, 1511588400, 1511588400, '36e0661a', -4, 0, 0)

Line : 189
File : sessions.php