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 ('31628d3f0fd6015e2653e28bfdb0b7ed', -1, 1508436999, 1508436999, '365c8dd3', -6, 0, 0)

Line : 172
File : sessions.php