diff --git a/webif/html/pkg/script.js b/webif/html/pkg/script.js
index bdbd557..eb5d957 100644
--- a/webif/html/pkg/script.js
+++ b/webif/html/pkg/script.js
@@ -139,7 +139,7 @@ function execopkg(arg, pkg)
 		error: function(_, _, e) {
 			if (window.console)
 				console.log("ajax error");
-			if (e.length)
+			if (e.trim().length)
 				alert(e);
 		}
 	});