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 ('904171282ae86d1f0b4f0c5b482e79fa', -1, 1524400973, 1524400973, '36506778', 15, 0, 0)

Line : 187
File : sessions.php