phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8251e4c0b7738a6826dc1289d19d6778' 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 ('8251e4c0b7738a6826dc1289d19d6778', -1, 1764121140, 1764121140, 'd849d8b0', -4, 0, 0)

Line : 187
File : sessions.php