phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '83426a4cc7b401f2e6e9ae3c5bfaf975' 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 ('83426a4cc7b401f2e6e9ae3c5bfaf975', -1, 1771166959, 1771166959, 'd849d800', -4, 0, 0)

Line : 187
File : sessions.php