phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '15f2eaa18e142de358c4814938d38d61' 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 ('15f2eaa18e142de358c4814938d38d61', -1, 1771803510, 1771803510, '2d971ed8', 1, 0, 0)

Line : 187
File : sessions.php