phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '0502ff7b308d9601a6173b8b5018da80' 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 ('0502ff7b308d9601a6173b8b5018da80', -1, 1770978977, 1770978977, 'd849d809', -4, 0, 0)

Line : 187
File : sessions.php