phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6960f68cd53e28ea143739e7ee38ebd6' 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 ('6960f68cd53e28ea143739e7ee38ebd6', -1, 1780279696, 1780279696, 'd849d921', 1, 0, 0)

Line : 187
File : sessions.php