diff --git a/frontend/src/routes/+error.svelte b/frontend/src/routes/+error.svelte
index f910cb33..56ce49c4 100644
--- a/frontend/src/routes/+error.svelte
+++ b/frontend/src/routes/+error.svelte
@@ -7,10 +7,16 @@ let copied = $state(false);
 function copyId() {
 	const id = page.error?.errorId;
 	if (!id) return;
-	navigator.clipboard.writeText(id).then(() => {
-		copied = true;
-		setTimeout(() => (copied = false), 2000);
-	});
+	if (!navigator.clipboard) return;
+	navigator.clipboard.writeText(id).then(
+		() => {
+			copied = true;
+			setTimeout(() => (copied = false), 2000);
+		},
+		() => {
+			/* clipboard denied or unavailable — select-all on the <code> element remains */
+		}
+	);
 }
 </script>
 
diff --git a/frontend/src/routes/error.svelte.test.ts b/frontend/src/routes/error.svelte.test.ts
index 7ed53214..0ceca01f 100644
--- a/frontend/src/routes/error.svelte.test.ts
+++ b/frontend/src/routes/error.svelte.test.ts
@@ -94,4 +94,38 @@ describe('+error.svelte', () => {
 
 		await expect.element(browserPage.getByText('Fehler-ID')).not.toBeInTheDocument();
 	});
+
+	it('shows "Kopiert!" after clicking the copy button', async () => {
+		mockPage.status = 500;
+		mockPage.error = { message: 'Something broke', errorId: 'abc-123-def' };
+
+		Object.defineProperty(navigator, 'clipboard', {
+			value: { writeText: vi.fn().mockResolvedValue(undefined) },
+			configurable: true,
+			writable: true
+		});
+
+		const ErrorPage = await loadComponent();
+		render(ErrorPage);
+
+		await browserPage.getByRole('button', { name: 'ID kopieren' }).click();
+		await expect.element(browserPage.getByText('Kopiert!')).toBeVisible();
+	});
+
+	it('does not show "Kopiert!" when clipboard write is rejected', async () => {
+		mockPage.status = 500;
+		mockPage.error = { message: 'Something broke', errorId: 'abc-123-def' };
+
+		Object.defineProperty(navigator, 'clipboard', {
+			value: { writeText: vi.fn().mockRejectedValue(new Error('denied')) },
+			configurable: true,
+			writable: true
+		});
+
+		const ErrorPage = await loadComponent();
+		render(ErrorPage);
+
+		await browserPage.getByRole('button', { name: 'ID kopieren' }).click();
+		await expect.element(browserPage.getByText('Kopiert!')).not.toBeInTheDocument();
+	});
 });