diff --git a/Logic/FeatureSource/Sources/GeoJsonSource.ts b/Logic/FeatureSource/Sources/GeoJsonSource.ts
index 9763e089f3..df7270255c 100644
--- a/Logic/FeatureSource/Sources/GeoJsonSource.ts
+++ b/Logic/FeatureSource/Sources/GeoJsonSource.ts
@@ -95,6 +95,11 @@ export default class GeoJsonSource implements FeatureSourceForLayer, Tiled {
                 for (const feature of json.features) {
                     const props = feature.properties
                     for (const key in props) {
+                        
+                        if(props[key] === null){
+                            delete props[key]
+                        }
+                        
                         if (typeof props[key] !== "string") {
                             // Make sure all the values are string, it crashes stuff otherwise
                             props[key] = JSON.stringify(props[key])
diff --git a/assets/themes/uk_addresses/uk_addresses.json b/assets/themes/uk_addresses/uk_addresses.json
index c7ec66fd8d..8737ddebaa 100644
--- a/assets/themes/uk_addresses/uk_addresses.json
+++ b/assets/themes/uk_addresses/uk_addresses.json
@@ -90,7 +90,7 @@
         "isOsmCache": false
       },
       "name": "Addresses to check",
-      "minzoom": 14,
+      "minzoom": 18,
       "title": {
         "render": {
           "en": "This address needs adding"
@@ -140,6 +140,7 @@
           "options": [
             {
               "question": "Only show non-matched objects",
+              "default": true,
               "osmTags": {
                 "and": [
                   "_imported=",