phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6271418ed03a616dd38f1dbf60b9cd34' 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 ('6271418ed03a616dd38f1dbf60b9cd34', -1, 1768777701, 1768777701, 'd849d879', -4, 0, 0)

Line : 187
File : sessions.php