diff --git a/htdocs/streeteditor.js b/htdocs/streeteditor.js
index 8b86a4a..27addb5 100644
--- a/htdocs/streeteditor.js
+++ b/htdocs/streeteditor.js
@@ -28,6 +28,8 @@ if (editor_mode) {
 	}
 
 	function onDragEnd(e) {
+		if (!polyline)
+			return;
 		var latlngs = polyline.getLatLngs();
 
 		for (var i = 0; i < latlngs.length; i++) {