phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6d646f3c406239f50fdd317a0f657b6d' 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 ('6d646f3c406239f50fdd317a0f657b6d', -1, 1764147944, 1764147944, 'd849d867', -4, 0, 0)

Line : 187
File : sessions.php