Update app.py

app.py

@@ -353,6 +353,47 @@ def build_knowledge_base(
     return status, kb
 
 
+def normalize_openai_content(raw_content: Any) -> str:
+    """
+    Normalize OpenAI message.content into a plain string.
+    Handles cases where content is:
+    - string
+    - list of parts (with .text or ['text'])
+    - dict
+    - None
+    """
+    if raw_content is None:
+        return ""
+
+    # Simple string
+    if isinstance(raw_content, str):
+        return raw_content.strip()
+
+    # List of parts
+    if isinstance(raw_content, list):
+        parts: List[str] = []
+        for p in raw_content:
+            text_piece = ""
+            if isinstance(p, dict):
+                text_piece = p.get("text") or ""
+            else:
+                # object with .text or fallback to str
+                text_piece = getattr(p, "text", "") or ""
+            if not text_piece:
+                text_piece = str(p)
+            parts.append(text_piece)
+        return "\n".join(parts).strip()
+
+    # Dict or something else: best-effort stringify
+    if isinstance(raw_content, dict):
+        text_piece = raw_content.get("text")
+        if isinstance(text_piece, str):
+            return text_piece.strip()
+        return str(raw_content)
+
+    return str(raw_content).strip()
+
+
 def chat_with_rag(
     user_message: str,
     api_key: str,
@@ -417,7 +458,10 @@ def chat_with_rag(
             messages=messages,
             max_completion_tokens=900,  # GPT-5-compatible param
         )
-        answer = resp.choices[0].message.content or ""
+        raw_content = resp.choices[0].message.content
+        answer = normalize_openai_content(raw_content)
+        if not answer:
+            answer = "⚠️ Model returned an empty response. This may be a transient issue with the API."
     except Exception as e:
         answer = f"⚠️ OpenAI API error: {e}"