When applying a filter by specification (side menu) with special character, the system returns a white screen with the following error 400: "Bad Request! Scripts are not allowed!"

To simulate the behavior:

1. Set a field value (product specification or SKU) with a special character (parentheses, for example) in any category;
2. In the catalog, select a product from the category and set it up with the specification value created in the first step. Save the product;
3. Wait for indexing;
4. Access the category directly from the web site;
5. On the side filter (SearchResult control), click the specification value (filter) configured with the special character;
6. Error 400: Bad Request! Scripts are not allowed!

To work around the problem, avoid using special characters in the product specification and/or SKU values.