diff --git a/assets/webui/ofdgo.js b/assets/webui/ofdgo.js
index ea94a20..6ad1660 100644
--- a/assets/webui/ofdgo.js
+++ b/assets/webui/ofdgo.js
@@ -1362,7 +1362,7 @@ function printPDF(bytes, openSeq) {
 				return;
 			}
 			try {
-				frame.contentWindow.addEventListener("afterprint", clear, { once: true });
+				frame.contentDocument?.defaultView.addEventListener("afterprint", clear, { once: true });
 				frame.contentWindow.print();
 				resolve();
 			} catch {