diff --git a/Models/ThemeConfig/Conversion/Conversion.ts b/Models/ThemeConfig/Conversion/Conversion.ts
index 91a89a545..d2a8184e6 100644
--- a/Models/ThemeConfig/Conversion/Conversion.ts
+++ b/Models/ThemeConfig/Conversion/Conversion.ts
@@ -72,6 +72,7 @@ export abstract class DesugaringStep<T> extends Conversion<T, T> {}
 class Pipe<TIn, TInter, TOut> extends Conversion<TIn, TOut> {
     private readonly _step0: Conversion<TIn, TInter>
     private readonly _step1: Conversion<TInter, TOut>
+
     constructor(step0: Conversion<TIn, TInter>, step1: Conversion<TInter, TOut>) {
         super("Merges two steps with different types", [], `Pipe(${step0.name}, ${step1.name})`)
         this._step0 = step0
@@ -92,9 +93,9 @@ class Pipe<TIn, TInter, TOut> extends Conversion<TIn, TOut> {
         }
 
         const r = this._step1.convert(result, context)
-        errors.push(...r.errors)
-        information.push(...r.information)
-        warnings.push(...r.warnings)
+        Utils.PushList(errors, r.errors)
+        Utils.PushList(warnings, r.warnings)
+        Utils.PushList(information, r.information)
         return {
             result: r.result,
             errors,
@@ -106,6 +107,7 @@ class Pipe<TIn, TInter, TOut> extends Conversion<TIn, TOut> {
 
 class Pure<TIn, TOut> extends Conversion<TIn, TOut> {
     private readonly _f: (t: TIn) => TOut
+
     constructor(f: (t: TIn) => TOut) {
         super("Wrapper around a pure function", [], "Pure")
         this._f = f
@@ -145,9 +147,9 @@ export class Each<X, Y> extends Conversion<X[], Y[]> {
         const result: Y[] = []
         for (let i = 0; i < values.length; i++) {
             const r = step.convert(values[i], context + "[" + i + "]")
-            information.push(...r.information)
-            warnings.push(...r.warnings)
-            errors.push(...r.errors)
+            Utils.PushList(information, r.information)
+            Utils.PushList(warnings, r.warnings)
+            Utils.PushList(errors, r.errors)
             result.push(r.result)
         }
         return {
diff --git a/Utils.ts b/Utils.ts
index 6fae645c5..7371308c3 100644
--- a/Utils.ts
+++ b/Utils.ts
@@ -456,6 +456,13 @@ In the case that MapComplete is pointed to the testing grounds, the edit will be
         console.log("Added custom css file ", location)
     }
 
+    public static PushList<T>(target: T[], source?: T[]) {
+        if (source === undefined) {
+            return
+        }
+        target.push(...source)
+    }
+
     /**
      * Copies all key-value pairs of the source into the target. This will change the target
      * If the key starts with a '+', the values of the list will be appended to the target instead of overwritten