Fix: fix #1917

src/Logic/MetaTagging.ts

@@ -228,6 +228,10 @@ export default class MetaTagging {
                     })
                     return feats
                 }
+                if(!state.perLayer.get(layerId)){
+                    // This layer is not loaded
+                    return []
+                }
                 return [state.perLayer.get(layerId).GetFeaturesWithin(bbox)]
             },
         }

src/Models/ThemeConfig/Conversion/PrepareTheme.ts

@@ -475,7 +475,13 @@ class AddDependencyLayersToTheme extends DesugaringStep<LayoutConfigJson> {
                 )
             }
         }
-        layers.unshift(...dependencies.map((l) => l.config))
+        /**
+         * Must be added to the _end_ of the layer list:
+         * - Imagine that 'walls_and_buildings' is added...
+         * - but there is a layer about a specific type of building already
+         * Adding it up front would cause 'walls_and_buildings' to be triggered
+         */
+        layers.push(...dependencies.map((l) => l.config))
 
         return {
             ...theme,

src/Utils.ts

@@ -331,11 +331,16 @@ In the case that MapComplete is pointed to the testing grounds, the edit will be
             configurable: true,
             get: () => {
                 delete object[name]
-                object[name] = init()
+                try{
-                if (whenDone) {
+                    object[name] = init()
-                    whenDone()
+                    if (whenDone) {
+                        whenDone()
+                    }
+                    return object[name]
+                }catch (e) {
+                    console.error("Error while calculating a lazy property", e)
+                    return undefined
                 }
-                return object[name]
             },
         })
     }