Index: build/chrome/ui.js
==================================================================
--- build/chrome/ui.js
+++ build/chrome/ui.js
@@ -23,11 +23,13 @@
 
 		html += "\t<li>";
 		html += "\t\t" + certObj.getSubjectString() + ":" + certObj.getSerialNumberHex();
 		html += "\t\t<ol type=\"a\">";
 		html += "\t\t\t<li>Serial Number: " + certObj.getSerialNumberHex() + "</li>";
-		html += "\t\t\t<li>Usage: " + X509.getExtKeyUsageString(certObj.hex) + "</li>";
+		try {
+			html += "\t\t\t<li>Usage: " + X509.getExtKeyUsageString(certObj.hex) + "</li>";
+		} catch (_) {};
 		html += "\t\t</ol>";
 		html += "\t</li>";
 	}
 
 	html += "</ol>";