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I found a solution.

Go to themes\YOURTHEMENAME\templates\catalog\_partials\miniatures\product.tpl 

line 52 you will find <div class="product-actions">

comment the <form> below like this:

 <div class="product-actions">
          <!--
                      <form action="{$urls.pages.cart}" method="post" class="add-to-cart-or-refresh">
                        <input type="hidden" name="token" value="{$static_token}">
                        <input type="hidden" name="id_product" value="{$product.id}" class="product_page_product_id">
                        <input type="hidden" name="id_customization" value="0" class="product_customization_id">
                        <button class="btn btn-primary add-to-cart" data-button-action="add-to-cart" type="submit" {if $product.availability == 'unavailable'}disabled{/if}data-toggle="tooltip" title="Add to cart">
                            {l s='' d='Shop.Theme.Actions'}
                            <i class="material-icons">&#xE8CC;</i>
                        </button>
                    </form>
        -->
                </div>

Now everithing works.