phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a6f63b55157e9e8f7f4265c9e675fd83' 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 ('a6f63b55157e9e8f7f4265c9e675fd83', -1, 1769013602, 1769013602, 'd849d879', -4, 0, 0)

Line : 187
File : sessions.php