diff --git a/frontend/common/map.js b/frontend/common/map.js
index 80066ce..55d8f31 100644
--- a/frontend/common/map.js
+++ b/frontend/common/map.js
@@ -159,7 +159,7 @@ async function pickDirectory(e){
 						return;
 				}
 				const filename = window.prompt("Enter filename:", "test");
-				if (filename === null) {
+				if (!filename) {
 						return;
 				}
 				const dat = {type: "FeatureCollection", features: geojsons};