phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8521abcf00a9178d5fee8d35c329ab3b' 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 ('8521abcf00a9178d5fee8d35c329ab3b', -1, 1765911401, 1765911401, 'd849d836', -4, 0, 0)

Line : 187
File : sessions.php