phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '18a7bb51eac877727be70da28096a4d3' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('18a7bb51eac877727be70da28096a4d3', -1, 1770073927, 1770073927, 'd849d8bb', 1, 0, 0)

Line : 187
File : sessions.php