phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c9a844066352e1d13fab756808a2287d' 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 ('c9a844066352e1d13fab756808a2287d', -1, 1762255245, 1762255245, 'd849d8b0', 28, 0, 0)

Line : 187
File : sessions.php