diff --git a/src/routes/images.ts b/src/routes/images.ts
index d8ad8e1..6bd43d3 100644
--- a/src/routes/images.ts
+++ b/src/routes/images.ts
@@ -20,8 +20,8 @@ router.post('/', async (req, res) => {
     });
 
     const chatModels = await getAvailableChatModelProviders();
-    const provider = chat_model_provider || Object.keys(chatModels)[0];
-    const chatModel = chat_model || Object.keys(chatModels[provider])[0];
+    const provider = chat_model_provider ?? Object.keys(chatModels)[0];
+    const chatModel = chat_model ?? Object.keys(chatModels[provider])[0];
 
     let llm: BaseChatModel | undefined;
 
diff --git a/src/routes/suggestions.ts b/src/routes/suggestions.ts
index 10e5715..b15ff5f 100644
--- a/src/routes/suggestions.ts
+++ b/src/routes/suggestions.ts
@@ -20,8 +20,8 @@ router.post('/', async (req, res) => {
     });
 
     const chatModels = await getAvailableChatModelProviders();
-    const provider = chat_model_provider || Object.keys(chatModels)[0];
-    const chatModel = chat_model || Object.keys(chatModels[provider])[0];
+    const provider = chat_model_provider ?? Object.keys(chatModels)[0];
+    const chatModel = chat_model ?? Object.keys(chatModels[provider])[0];
 
     let llm: BaseChatModel | undefined;
 
diff --git a/src/routes/videos.ts b/src/routes/videos.ts
index e117a5a..0ffdb2c 100644
--- a/src/routes/videos.ts
+++ b/src/routes/videos.ts
@@ -20,8 +20,8 @@ router.post('/', async (req, res) => {
     });
 
     const chatModels = await getAvailableChatModelProviders();
-    const provider = chat_model_provider || Object.keys(chatModels)[0];
-    const chatModel = chat_model || Object.keys(chatModels[provider])[0];
+    const provider = chat_model_provider ?? Object.keys(chatModels)[0];
+    const chatModel = chat_model ?? Object.keys(chatModels[provider])[0];
 
     let llm: BaseChatModel | undefined;