diff --git a/assets/themes/mapcomplete-changes/mapcomplete-changes.json b/assets/themes/mapcomplete-changes/mapcomplete-changes.json
index 99de2cacb..fe87d0a9e 100644
--- a/assets/themes/mapcomplete-changes/mapcomplete-changes.json
+++ b/assets/themes/mapcomplete-changes/mapcomplete-changes.json
@@ -261,6 +261,10 @@
                     "if": "theme=ghostsigns",
                     "then": "./assets/themes/advertising/wall_painting.svg"
                   },
+                  {
+                    "if": "theme=glutenfree",
+                    "then": "./assets/themes/glutenfree/glutenfree.svg"
+                  },
                   {
                     "if": "theme=grb",
                     "then": "./assets/themes/grb/logo.svg"
diff --git a/scripts/Script.ts b/scripts/Script.ts
index a12c551ed..c7e442fb3 100644
--- a/scripts/Script.ts
+++ b/scripts/Script.ts
@@ -22,7 +22,7 @@ export default abstract class Script {
                 const green = (s) => "\x1b[92m" + s + "\x1b[0m"
                 console.log(green("All done! (" + millisNeeded + " ms)"))
             })
-            .catch((e) => console.log("ERROR:", e))
+            .catch((e) => console.log("ERROR in script:", e))
     }
 
     public printHelp() {
diff --git a/src/Models/ThemeConfig/Conversion/Conversion.ts b/src/Models/ThemeConfig/Conversion/Conversion.ts
index 357389523..b9799b442 100644
--- a/src/Models/ThemeConfig/Conversion/Conversion.ts
+++ b/src/Models/ThemeConfig/Conversion/Conversion.ts
@@ -35,7 +35,15 @@ export abstract class Conversion<TIn, TOut> {
     public convertStrict(json: TIn, context?: ConversionContext): TOut {
         context ??= ConversionContext.construct([], [])
         context = context.inOperation(this.name)
-        const fixed = this.convert(json, context)
+
+        let fixed: TOut
+        try {
+            fixed = this.convert(json, context)
+        } catch (e) {
+            console.error(e)
+            context.err("ERROR WHILE RUNNING STEP " + this.name+": "+e)
+            fixed = undefined
+        }
         for (const msg of context.messages) {
             if (msg.level === "debug") {
                 continue
@@ -46,11 +54,12 @@ export abstract class Conversion<TIn, TOut> {
             throw new Error(
                 [
                     "Detected one or more errors, stopping now:",
-                    context.getAll("error").map((e) => e.context.path.join(".") + ": " + e.message),
+                    context.getAll("error").map((e) => e.context.path.join(".") + ": " + e.message)
                 ].join("\n\t")
             )
         }
         return fixed
+
     }
 
     public andThenF<X>(f: (tout: TOut) => X): Conversion<TIn, X> {
@@ -60,7 +69,8 @@ export abstract class Conversion<TIn, TOut> {
     public abstract convert(json: TIn, context: ConversionContext): TOut
 }
 
-export abstract class DesugaringStep<T> extends Conversion<T, T> {}
+export abstract class DesugaringStep<T> extends Conversion<T, T> {
+}
 
 export class Pipe<TIn, TInter, TOut> extends Conversion<TIn, TOut> {
     private readonly _step0: Conversion<TIn, TInter>
@@ -247,7 +257,7 @@ export class Cached<TIn, TOut> extends Conversion<TIn, TOut> {
         const converted = this._step.convert(json, context)
         Object.defineProperty(json, this.key, {
             value: converted,
-            enumerable: false,
+            enumerable: false
         })
         return converted
     }
@@ -260,8 +270,8 @@ export class Fuse<T> extends DesugaringStep<T> {
     constructor(doc: string, ...steps: DesugaringStep<T>[]) {
         super(
             (doc ?? "") +
-                "This fused pipeline of the following steps: " +
-                steps.map((s) => s.name).join(", "),
+            "This fused pipeline of the following steps: " +
+            steps.map((s) => s.name).join(", "),
             Utils.Dedup([].concat(...steps.map((step) => step.modifiedAttributes))),
             "Fuse(" + steps.map((s) => s.name).join(", ") + ")"
         )
diff --git a/src/Models/ThemeConfig/Conversion/ConversionContext.ts b/src/Models/ThemeConfig/Conversion/ConversionContext.ts
index 302435985..ee38c8c62 100644
--- a/src/Models/ThemeConfig/Conversion/ConversionContext.ts
+++ b/src/Models/ThemeConfig/Conversion/ConversionContext.ts
@@ -124,9 +124,9 @@ export class ConversionContext {
         this.messages.push({ context: this, level: "warning", message })
     }
 
-    err(message: string) {
+    err(...message: string[]) {
         this._hasErrors = true
-        this.messages.push({ context: this, level: "error", message })
+        this.messages.push({ context: this, level: "error", message: message.join(" ") })
     }
 
     info(message: string) {
diff --git a/src/Models/ThemeConfig/Conversion/PrepareLayer.ts b/src/Models/ThemeConfig/Conversion/PrepareLayer.ts
index 2199ff44b..9dd2a3f8f 100644
--- a/src/Models/ThemeConfig/Conversion/PrepareLayer.ts
+++ b/src/Models/ThemeConfig/Conversion/PrepareLayer.ts
@@ -83,7 +83,6 @@ class ExpandFilter extends DesugaringStep<LayerConfigJson> {
                     context.err("Got undefined as filter expansion in "+tagRendering["id"])
                     continue
                 }
-                console.log("Adding filter",filterName," due to", tagRendering["id"])
                 filters.push(filterName)
             }
         }
diff --git a/src/Models/ThemeConfig/Conversion/PrepareTheme.ts b/src/Models/ThemeConfig/Conversion/PrepareTheme.ts
index a634944c3..dca64f6b9 100644
--- a/src/Models/ThemeConfig/Conversion/PrepareTheme.ts
+++ b/src/Models/ThemeConfig/Conversion/PrepareTheme.ts
@@ -71,6 +71,10 @@ class SubstituteLayer extends Conversion<string | LayerConfigJson, LayerConfigJs
 
         for (const name of names) {
             const found = Utils.Clone(state.sharedLayers.get(name))
+            if(found === undefined){
+                context.err("Layer with name "+name+" not found")
+                continue
+            }
             found["_basedOn"] = name
             if (found === undefined) {
                 reportNotFound(name)
@@ -367,7 +371,8 @@ class AddDependencyLayersToTheme extends DesugaringStep<LayoutConfigJson> {
     private static CalculateDependencies(
         alreadyLoaded: LayerConfigJson[],
         allKnownLayers: Map<string, LayerConfigJson>,
-        themeId: string
+        themeId: string,
+        context: ConversionContext
     ): { config: LayerConfigJson; reason: string }[] {
         const dependenciesToAdd: { config: LayerConfigJson; reason: string }[] = []
         const loadedLayerIds: Set<string> = new Set<string>(alreadyLoaded.map((l) => l?.id))
@@ -388,6 +393,7 @@ class AddDependencyLayersToTheme extends DesugaringStep<LayoutConfigJson> {
             }[] = []
 
             for (const layerConfig of alreadyLoaded) {
+
                 try {
                     const layerDeps = DependencyCalculator.getLayerDependencies(
                         new LayerConfig(layerConfig, themeId + "(dependencies)")
@@ -396,7 +402,7 @@ class AddDependencyLayersToTheme extends DesugaringStep<LayoutConfigJson> {
                 } catch (e) {
                     console.error(e)
                     throw (
-                        "Detecting layer dependencies for " + layerConfig.id + " failed due to " + e
+                        "Detecting layer dependencies for " + layerConfig?.id + " failed due to " + e
                     )
                 }
             }
@@ -467,7 +473,8 @@ class AddDependencyLayersToTheme extends DesugaringStep<LayoutConfigJson> {
         const dependencies = AddDependencyLayersToTheme.CalculateDependencies(
             layers,
             allKnownLayers,
-            theme.id
+            theme.id,
+            context
         )
         if (dependencies.length > 0) {
             for (const dependency of dependencies) {
diff --git a/src/Models/ThemeConfig/FilterConfig.ts b/src/Models/ThemeConfig/FilterConfig.ts
index c09c2d9d3..ea5eef310 100644
--- a/src/Models/ThemeConfig/FilterConfig.ts
+++ b/src/Models/ThemeConfig/FilterConfig.ts
@@ -25,8 +25,11 @@ export default class FilterConfig {
     public readonly defaultSelection?: number
 
     constructor(json: FilterConfigJson, context: string) {
+        if(typeof json === "string"){
+            throw "Got a non-expanded filter, just a string: "+json
+        }
         if (json.options === undefined) {
-            throw `A filter without options was given at ${context}`
+            throw `A filter without options was given at ${context}. The ID is ${JSON.stringify(json)}`
         }
         if (json.id === undefined) {
             throw `A filter without id was found at ${context}`
diff --git a/src/Models/ThemeConfig/LayerConfig.ts b/src/Models/ThemeConfig/LayerConfig.ts
index 262dd52fc..d2cd38ef3 100644
--- a/src/Models/ThemeConfig/LayerConfig.ts
+++ b/src/Models/ThemeConfig/LayerConfig.ts
@@ -72,7 +72,7 @@ export default class LayerConfig extends WithContextLoader {
     private readonly _basedOn: string | undefined
 
     constructor(json: LayerConfigJson, context?: string, official: boolean = true) {
-        context = context + "." + json.id
+        context = context + "." + json?.id
         const translationContext = "layers:" + json.id
         super(json, context)
         this.id = json.id
@@ -292,7 +292,9 @@ export default class LayerConfig extends WithContextLoader {
             this.filterIsSameAs = json.filter["sameAs"]
             this.filters = []
         } else {
-            this.filters = (<FilterConfigJson[]>json.filter ?? []).map((option, i) => {
+            this.filters = (<FilterConfigJson[]>json.filter ?? [])
+                .filter(f => typeof f !== "string")
+                .map((option, i) => {
                 return new FilterConfig(option, `layers:${this.id}.filter.${i}`)
             })
         }