diff --git a/js/index.js b/js/index.js
index e8fcae3..6dc7021 100644
--- a/js/index.js
+++ b/js/index.js
@@ -124,11 +124,13 @@ function updateActiveFeature(feature_or_featureid){
 }
 
 document.getElementById("result-panel").addEventListener("activePanelChange", e => {
-	let activeElement = e.target.children[e.activePanelIndex]
-	if(activeElement instanceof FeatureElement){
-		let feature = activeElement.feature
-		updateActiveFeature(feature)
-	} else {
-		MAP.unhighlight_all()
+	if(e.activePanelIndex){
+		let activeElement = e.target.children[e.activePanelIndex]
+		if(activeElement instanceof FeatureElement){
+			let feature = activeElement.feature
+			updateActiveFeature(feature)
+		} else {
+			MAP.unhighlight_all()
+		}
 	}
 })