phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c847ba436e85d8939dc22d8a7250f674' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c847ba436e85d8939dc22d8a7250f674', -1, 1762288863, 1762288863, 'd849d802', 16, 0, 0)

Line : 187
File : sessions.php