diff --git a/src/core/client.test.ts b/src/core/client.test.ts
new file mode 100644
index 0000000..90bfcd8
--- /dev/null
+++ b/src/core/client.test.ts
@@ -0,0 +1,22 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { PixelmuseClient } from './client.js'
+
+describe('PixelmuseClient', () => {
+  afterEach(() => {
+    vi.restoreAllMocks()
+  })
+
+  it('handles successful DELETE responses with empty bodies', async () => {
+    const fetchMock = vi.spyOn(globalThis, 'fetch').mockResolvedValue(
+      new Response(null, { status: 204 }),
+    )
+    const client = new PixelmuseClient('pm_test_' + 'a'.repeat(32))
+
+    await expect(client.deleteGeneration('gen_123')).resolves.toBeUndefined()
+
+    expect(fetchMock).toHaveBeenCalledWith(
+      'https://www.pixelmuse.studio/api/v1/images/gen_123',
+      expect.objectContaining({ method: 'DELETE' }),
+    )
+  })
+})
diff --git a/src/core/client.ts b/src/core/client.ts
index f53afb6..e45ad32 100644
--- a/src/core/client.ts
+++ b/src/core/client.ts
@@ -79,7 +79,11 @@ export class PixelmuseClient {
       )
     }
 
-    return (await res.json()) as T
+    const bodyText = await res.text()
+    if (bodyText.trim().length === 0) {
+      return undefined as T
+    }
+    return JSON.parse(bodyText) as T
   }
 
   /** Generate an image. Uses Prefer: wait=55 for sync response. */