phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b4780d31cf3e8b99febe31569eb0da78' 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 ('b4780d31cf3e8b99febe31569eb0da78', -1, 1773737422, 1773737422, 'd849d817', 1, 0, 0)

Line : 187
File : sessions.php