Update app.py

app.py

@@ -88,8 +88,34 @@ def _check_and_count_usage(ip: str) -> tuple[bool, int]:
     return True, current_count + 1
 
 
+def _safe_text(value) -> str:
+    """Convert Gradio message content into safe plain text."""
+    if value is None:
+        return ""
+
+    if isinstance(value, str):
+        return value.strip()
+
+    if isinstance(value, dict):
+        # Some Gradio versions store content inside nested dicts.
+        content = value.get("content", "")
+        if isinstance(content, str):
+            return content.strip()
+        return str(content).strip()
+
+    if isinstance(value, (list, tuple)):
+        parts = []
+        for item in value:
+            text = _safe_text(item)
+            if text:
+                parts.append(text)
+        return " ".join(parts).strip()
+
+    return str(value).strip()
+
+
 def _format_prompt(message: str, history) -> str:
-    clean_message = message.strip()[:MAX_INPUT_CHARS]
+    clean_message = _safe_text(message)[:MAX_INPUT_CHARS]
     recent_history = history[-MAX_HISTORY_MESSAGES:] if history else []
 
     prompt_parts = [f"System: {SYSTEM_PROMPT}\n"]
@@ -97,7 +123,7 @@ def _format_prompt(message: str, history) -> str:
     for item in recent_history:
         if isinstance(item, dict):
             role = item.get("role", "")
-            content = (item.get("content") or "").strip()
+            content = _safe_text(item.get("content", ""))
 
             if role == "user" and content:
                 prompt_parts.append(f"User: {content}")
@@ -105,8 +131,8 @@ def _format_prompt(message: str, history) -> str:
                 prompt_parts.append(f"Assistant: {content}")
 
         elif isinstance(item, (list, tuple)) and len(item) >= 2:
-            user_msg = str(item[0] or "").strip()
-            bot_msg = str(item[1] or "").strip()
+            user_msg = _safe_text(item[0])
+            bot_msg = _safe_text(item[1])
 
             if user_msg:
                 prompt_parts.append(f"User: {user_msg}")