Duplicate pages since categories have ? but no url params

[FluffyCat]

Hi

 

I ran our shop through deepcrawl and it reports we have duplicated pages for our categories. 

 

The only difference is that the duplicated url's have the ? in the end but no url params, like this:

mysite/es/accesorios-cocina  Ok link

mysite/es/accesorios-cocina? Duplicated link with empty url params.

 

We are using PS 1.5.4.1. Does anyone know where this ? comes from, its not visible when browsing the category pages and the links in the sitemap are also ok.

 

Any ideas on how to get rid of it?

 

Thanks in advance