fix

app.py

@@ -157,8 +157,11 @@ def is_valid_unicode(char):
         return False  # Invalid Unicode character
 
 def remove_invalid_unicode(input_string):
-    valid_chars = [char for char in input_string if is_valid_unicode(char)]
-    return ''.join(valid_chars)
+    if isinstance(input_string, str):
+        valid_chars = [char for char in input_string if is_valid_unicode(char)]
+        return ''.join(valid_chars)
+    else:
+        return input_string  # Return non-string values as is
 
 dummy1 = gr.Textbox(visible=False)