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 ('d4ca02cd1b0cf8b33ee4d0378518ecd0', -1, 1540346441, 1540346441, '36a14d1e', 15, 0, 0)

Line : 189
File : sessions.php