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 ('f5b60e3ce1802e8f6d0f0f1595cffc8c', -1, 1510985947, 1510985947, '36a2fae3', 15, 0, 0)

Line : 187
File : sessions.php