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 ('b26c1cc3cf7731ab515ddb308b10e2c0', -1, 1511067363, 1511067363, '36e0661a', -4, 0, 0)

Line : 187
File : sessions.php