diff --git a/Models/ThemeConfig/Conversion/Conversion.ts b/Models/ThemeConfig/Conversion/Conversion.ts
index 63e8a181d1..ccecfcffc8 100644
--- a/Models/ThemeConfig/Conversion/Conversion.ts
+++ b/Models/ThemeConfig/Conversion/Conversion.ts
@@ -5,7 +5,7 @@ import {Utils} from "../../../Utils";
 export interface DesugaringContext {
     tagRenderings: Map<string, TagRenderingConfigJson>
     sharedLayers: Map<string, LayerConfigJson>,
-    publicLayers: Set<string>
+    publicLayers?: Set<string>
 }
 
 export abstract class Conversion<TIn, TOut> {
diff --git a/scripts/generateLayerOverview.ts b/scripts/generateLayerOverview.ts
index 4fc2064754..70c70739bf 100644
--- a/scripts/generateLayerOverview.ts
+++ b/scripts/generateLayerOverview.ts
@@ -188,8 +188,7 @@ class LayerOverviewUtils {
         const sharedLayers = new Map<string, LayerConfigJson>()
         const state: DesugaringContext = {
             tagRenderings: sharedTagRenderings,
-            sharedLayers,
-            publicLayers: new Set()
+            sharedLayers
         }
         const prepLayer = new PrepareLayer(state);
         for (const sharedLayerJson of layerFiles) {