Update app.py

app.py

@@ -32,7 +32,7 @@ def chat(message, history):
     for h in history:
         if isinstance(h, dict):
             messages.append(h)
-        else:
+        elif isinstance(h, (list, tuple)) and len(h) == 2:
             messages.append({"role": "user", "content": h[0]})
             messages.append({"role": "assistant", "content": h[1]})
     messages.append({"role": "user", "content": message})
@@ -53,7 +53,6 @@ def chat(message, history):
 
 demo = gr.ChatInterface(
     fn=chat,
-    type="messages",
     title="MathBio AI — Mathematical Biology Assistant",
     description="A specialized LLM for mathematical biology, epidemic modeling, PDEs, and operator learning. Fine-tuned on 27K arxiv-derived examples.",
     examples=[