Update Gemini caller

app.py

@@ -114,15 +114,28 @@ def call_gemini(prompt: str, vision_parts=None) -> str:
     resp = client.models.generate_content(
         model="gemini-2.5-flash-preview-04-17", **kwargs
     )
-    # Join all .text fields in case Gemini responds in multiple parts.
     try:
-        text = "".join(part.text for part in resp.candidates[0].content.parts)
+        resp = client.models.generate_content(
+            model="gemini-2.5-flash-preview-04-17", **kwargs
+        )
+        # Check for at least one valid candidate
+        if not resp.candidates:
+            raise RuntimeError("No candidates returned from Gemini")
+        # Start at first index 
+        candidate = resp.candidates[0]
+        if candidate.content is None or not hasattr(candidate.content, "parts"):
+            raise RuntimeError("Gemini candidate missing content parts")
+        # Join all .text fields in case Gemini responds in multiple parts.
+        text = "".join(part.text for part in candidate.content.parts if hasattr(part, "text"))
+        if not text.strip():
+            raise RuntimeError("Gemini response contained empty text")
+        # Success
+        logger.info(f"[LLM] ✅ Response received: {text[:100]}...")
+        return text.strip()
+    # Fail
     except Exception as e:
-        logger.error(f"[LLM] ❌ Failed to parse Gemini response: {e}")
+        logger.error(f"[LLM] ❌ Gemini API error: {e}")
         raise RuntimeError("Gemini API response format error")
-    # Handle response
-    logger.info(f"[LLM] Response: {text}")
-    return text.strip()
 
 @app.post("/voice-transcribe")
 async def voice_transcribe(file: UploadFile = File(...)):