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 ('79ebdc25fa3f8a1f40579a2a8781597d', -1, 1526886324, 1526886324, '36c46ede', -2, 0, 0)

Line : 186
File : sessions.php