phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '1871fb9f0410b21620477263c98b5ae8' 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 ('1871fb9f0410b21620477263c98b5ae8', -1, 1767343666, 1767343666, 'd849d82e', -4, 0, 0)

Line : 187
File : sessions.php