From d7f8ff01d511449cac876de0f3e0d9d2f31b9034 Mon Sep 17 00:00:00 2001
From: pietervdvn <pietervdvn@posteo.net>
Date: Tue, 18 Jan 2022 10:25:11 +0100
Subject: [PATCH] FilteringFeatureSource can now handle undefined values

---
 Logic/FeatureSource/Sources/FilteringFeatureSource.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Logic/FeatureSource/Sources/FilteringFeatureSource.ts b/Logic/FeatureSource/Sources/FilteringFeatureSource.ts
index 3ae3ff053..125018406 100644
--- a/Logic/FeatureSource/Sources/FilteringFeatureSource.ts
+++ b/Logic/FeatureSource/Sources/FilteringFeatureSource.ts
@@ -67,7 +67,7 @@ export default class FilteringFeatureSource implements FeatureSourceForLayer, Ti
         const layer = this.upstream.layer;
         const features: { feature: any; freshness: Date }[] = (this.upstream.features.data ?? []);
         const includedFeatureIds  = new Set<string>(); 
-        const newFeatures = features.filter((f) => {
+        const newFeatures = (features ?? []).filter((f) => {
 
             self.registerCallback(f.feature)