phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b87cf7c2d62342acdf0df77e1cc60660' 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 ('b87cf7c2d62342acdf0df77e1cc60660', -1, 1771562172, 1771562172, 'd849d8d9', -4, 0, 0)

Line : 215
File : sessions.php