diff --git a/app/config.test.js b/app/config.test.js
index 03cf9ac..c648520 100644
--- a/app/config.test.js
+++ b/app/config.test.js
@@ -105,4 +105,11 @@ describe('getLLMConfig', () => {
     assert.equal(cfg.provider, 'ollama');
     assert.equal(cfg.model, 'llama3');
   });
+
+  it('comma-only api key is treated as not set', () => {
+    process.env.OPENAI_API_KEY = ',,,';
+    const cfg = getLLMConfig();
+    assert.equal(cfg.provider, null);
+    assert.deepEqual(cfg.apiKeys, []);
+  });
 });