diff --git a/src/renderer/components/+preferences/__tests__/extensions.test.tsx b/src/renderer/components/+preferences/__tests__/extensions.test.tsx
index cc1cd507c9..ffa2917853 100644
--- a/src/renderer/components/+preferences/__tests__/extensions.test.tsx
+++ b/src/renderer/components/+preferences/__tests__/extensions.test.tsx
@@ -9,11 +9,74 @@ import type { DiContainer } from "@ogre-tools/injectable";
 import { getDiForUnitTesting } from "../../../getDiForUnitTesting";
 import { type DiRender, renderFor } from "../../test-utils/renderFor";
 import { Extensions } from "../extensions";
-import type { LensRendererExtension } from "../../../../extensions/lens-renderer-extension";
 import rendererExtensionsInjectable from "../../../../extensions/renderer-extensions.injectable";
 import { computed } from "mobx";
 import currentPathParametersInjectable from "../../../routes/current-path-parameters.injectable";
-import { getRendererExtensionFake } from "../../test-utils/get-renderer-extension-fake";
+import { LensRendererExtension } from "../../../../extensions/lens-renderer-extension";
+
+class SomeTestExtension extends LensRendererExtension {
+  constructor() {
+    super({
+      id: "some-test-extension-id",
+      absolutePath: "irrelevant",
+      isBundled: false,
+      isCompatible: false,
+      isEnabled: false,
+      manifest: { name: "some-test-extension-id", version: "some-version", engines: { lens: "^5.5.0" }},
+      manifestPath: "irrelevant",
+    });
+
+    this.appPreferences = [
+      {
+        title: "Some preference item",
+        id: "some-preference-item-id",
+  
+        components: {
+          Hint: () => <div data-testid="some-preference-item-hint" />,
+          Input: () => <div data-testid="some-preference-item-input" />,
+        },
+      },
+  
+      {
+        title: "Switch on when app starts",
+        id: "some-other-preference-item-id",
+  
+        components: {
+          Hint: () => <div data-testid="some-other-preference-item-hint" />,
+          Input: () => <div data-testid="some-other-preference-item-input" />,
+        },
+      },
+  
+      {
+        title: "irrelevant",
+        id: "some-unrelated-preference-item-id",
+        showInPreferencesTab: "some-tab",
+  
+        components: {
+          Hint: () => <div />,
+          Input: () => <div />,
+        },
+      },
+  
+      {
+        title: "preference for specific tab",
+        id: "preference-for-tab-item-id",
+        showInPreferencesTab: "metircs-extension-tab",
+  
+        components: {
+          Hint: () => <div />,
+          Input: () => <div />,
+        },
+      },
+    ];
+
+    this.appPreferenceTabs = [{
+      title: "Metrics tab",
+      id: "metircs-extension-tab",
+      orderNumber: 100,
+    }];
+  }
+}
 
 describe("<Extensions/>", () => {
   let di: DiContainer;
@@ -23,7 +86,7 @@ describe("<Extensions/>", () => {
     di = getDiForUnitTesting({ doGeneralOverrides: true });
     render = renderFor(di);
 
-    di.override(rendererExtensionsInjectable, () => computed(() => [getRendererExtensionFake(extensionWithSpecificPreferenceItems)]));
+    di.override(rendererExtensionsInjectable, () => computed(() => [new SomeTestExtension()]));
     di.override(currentPathParametersInjectable, () => computed(() => ({ extensionId: "some-test-extension-id" })));
   });
 
@@ -70,55 +133,3 @@ describe("<Extensions/>", () => {
   });
 });
 
-const extensionWithSpecificPreferenceItems: Partial<LensRendererExtension> = {
-  id: "some-test-extension-id",
-  appPreferences: [
-    {
-      title: "Some preference item",
-      id: "some-preference-item-id",
-
-      components: {
-        Hint: () => <div data-testid="some-preference-item-hint" />,
-        Input: () => <div data-testid="some-preference-item-input" />,
-      },
-    },
-
-    {
-      title: "Switch on when app starts",
-      id: "some-other-preference-item-id",
-
-      components: {
-        Hint: () => <div data-testid="some-other-preference-item-hint" />,
-        Input: () => <div data-testid="some-other-preference-item-input" />,
-      },
-    },
-
-    {
-      title: "irrelevant",
-      id: "some-unrelated-preference-item-id",
-      showInPreferencesTab: "some-tab",
-
-      components: {
-        Hint: () => <div />,
-        Input: () => <div />,
-      },
-    },
-
-    {
-      title: "preference for specific tab",
-      id: "preference-for-tab-item-id",
-      showInPreferencesTab: "metircs-extension-tab",
-
-      components: {
-        Hint: () => <div />,
-        Input: () => <div />,
-      },
-    },
-  ],
-
-  appPreferenceTabs: [{
-    title: "Metrics tab",
-    id: "metircs-extension-tab",
-    orderNumber: 100,
-  }],
-};
diff --git a/src/renderer/components/+preferences/extensions.tsx b/src/renderer/components/+preferences/extensions.tsx
index 22ff381470..736123bdc6 100644
--- a/src/renderer/components/+preferences/extensions.tsx
+++ b/src/renderer/components/+preferences/extensions.tsx
@@ -45,9 +45,13 @@ export const Extensions = withInjectables<Dependencies>(
       const extensions = di.inject(rendererExtensionsInjectable);
       const extension = extensions.get().find((extension) => extension.sanitizedExtensionId === extensionId);
 
+      if (!extension) {
+        throw new Error(`Extension ${extensionId} not found`);
+      }
+
       return {
         preferenceItems: di.inject(extensionsPreferenceItemsInjectable, pathParameters),
-        extensionName: extension?.manifest.name,
+        extensionName: extension.manifest.name,
       };
     },
   },