diff --git a/apps/design-system/src/app/not-found.tsx b/apps/design-system/src/app/not-found.old
similarity index 100%
rename from apps/design-system/src/app/not-found.tsx
rename to apps/design-system/src/app/not-found.old
diff --git a/apps/design-system/src/components/navigation/use-side-navigation-items.tsx b/apps/design-system/src/components/navigation/use-side-navigation-items.tsx
index abf7d5239..429404ce5 100644
--- a/apps/design-system/src/components/navigation/use-side-navigation-items.tsx
+++ b/apps/design-system/src/components/navigation/use-side-navigation-items.tsx
@@ -62,6 +62,10 @@ export function useSideNavigationItems() {
   const allDocumentIds = documents.getAll().map((document) => document.id);
   const documentHierarchy = getDocumentHierarchy(allDocumentIds);
 
+  if (!documentHierarchy) {
+    return [];
+  }
+
   const topLevelHierarchy = documentHierarchy.children.find(
     (child) => child.slug === slug[0]
   );
diff --git a/apps/design-system/src/lib/documents/document-hierarchy.ts b/apps/design-system/src/lib/documents/document-hierarchy.ts
index 1a10ef88c..763b82c1a 100644
--- a/apps/design-system/src/lib/documents/document-hierarchy.ts
+++ b/apps/design-system/src/lib/documents/document-hierarchy.ts
@@ -14,9 +14,11 @@ export type DocumentHierarchy = {
   children: DocumentHierarchy[];
 };
 
-function getDocumentHierarchyInternal(paths: string[]): DocumentHierarchy {
+function getDocumentHierarchyInternal(
+  paths: string[]
+): DocumentHierarchy | undefined {
   if (!paths || paths.length === 0) {
-    throw new Error(`Invalid paths.`);
+    return;
   }
 
   const hierarchy: DocumentHierarchy = {
@@ -86,9 +88,15 @@ function cleanSlugs(value: DocumentHierarchy): DocumentHierarchy {
   };
 }
 
-export function getDocumentHierarchy(paths: string[]): DocumentHierarchy {
+export function getDocumentHierarchy(
+  paths: string[]
+): DocumentHierarchy | undefined {
   const hierarchy = getDocumentHierarchyInternal(paths);
 
+  if (!hierarchy) {
+    return;
+  }
+
   return cloneDeepWith(hierarchy, (value) => {
     if (isDocumentHierarchy(value)) {
       return cleanSlugs(value);
diff --git a/package.json b/package.json
index 2a1ee7fbc..b6a468fc9 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,7 @@
   "scripts": {
     "design-system": "nx run @govie-ds/design-system:dev",
     "design-system:build": "nx run @govie-ds/design-system:build",
+    "design-system:build:prod": "cross-env CI=true && nx run @govie-ds/design-system:build",
     "build": "nx run-many --target=build --all",
     "test": "nx run-many --target=test --all --verbose",
     "tokens:build": "nx run @govie-ds/tokens:build",
@@ -16,6 +17,7 @@
     "components:storybook": "nx run @govie-ds/design-components:storybook"
   },
   "devDependencies": {
+    "cross-env": "^7.0.3",
     "nx": "^18.1.3"
   }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index fb8738094..aaec42af5 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -8,6 +8,9 @@ importers:
 
   .:
     devDependencies:
+      cross-env:
+        specifier: ^7.0.3
+        version: 7.0.3
       nx:
         specifier: ^18.1.3
         version: 18.1.3
@@ -3338,6 +3341,11 @@ packages:
   core-util-is@1.0.3:
     resolution: {integrity: sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ==}
 
+  cross-env@7.0.3:
+    resolution: {integrity: sha512-+/HKd6EgcQCJGh2PSjZuUitQBQynKor4wrFbRg4DtAgS1aWO+gU52xpH7M9ScGgXSYmAVS9bIJ8EzuaGw0oNAw==}
+    engines: {node: '>=10.14', npm: '>=6', yarn: '>=1'}
+    hasBin: true
+
   cross-spawn@7.0.3:
     resolution: {integrity: sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==}
     engines: {node: '>= 8'}
@@ -10191,6 +10199,10 @@ snapshots:
 
   core-util-is@1.0.3: {}
 
+  cross-env@7.0.3:
+    dependencies:
+      cross-spawn: 7.0.3
+
   cross-spawn@7.0.3:
     dependencies:
       path-key: 3.1.1