phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6bc8470668718e0fb650b760d2492f34' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6bc8470668718e0fb650b760d2492f34', -1, 1768398526, 1768398526, 'd849d8a2', -9, 0, 0)

Line : 187
File : sessions.php