From fb8f8764aae3e509df75f5d3f25daf11a19a0029 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Thu, 18 Aug 2022 16:09:31 -0700
Subject: Fix geofence crash

---
 modern/src/map/MapGeofence.js | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/modern/src/map/MapGeofence.js b/modern/src/map/MapGeofence.js
index 31554f11..3bfbca24 100644
--- a/modern/src/map/MapGeofence.js
+++ b/modern/src/map/MapGeofence.js
@@ -80,11 +80,13 @@ const MapGeofence = () => {
   }, [mapGeofences]);
 
   useEffect(() => {
-    map.getSource(id).setData({
-      type: 'FeatureCollection',
-      features: Object.values(geofences).map((geofence) => geofenceToFeature(theme, geofence)),
-    });
-  }, [geofences]);
+    if (mapGeofences) {
+      map.getSource(id).setData({
+        type: 'FeatureCollection',
+        features: Object.values(geofences).map((geofence) => geofenceToFeature(theme, geofence)),
+      });
+    }
+  }, [mapGeofences, geofences]);
 
   return null;
 };
-- 
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