phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '787a9d8a1428919260e86640b1a31e79' 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 ('787a9d8a1428919260e86640b1a31e79', -1, 1772113043, 1772113043, '7f000001', -9, 0, 0)

Line : 187
File : sessions.php