phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c4d9ef8d5d543b6271397d46c86128f2' 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 ('c4d9ef8d5d543b6271397d46c86128f2', -1, 1769890747, 1769890747, 'd849d851', -4, 0, 0)

Line : 187
File : sessions.php