WordPress: get ACF-field from post-category in menu-walker

A pretty specific problem.
I’m using the menu-walker to create a sub-menu, on one of the pages I wish to use an ACF-Field from all the posts with a specific category and put it into the menu. The Else
This is my menu walker custom-code, the esle-part works fine, the if gallery.php doesn’t give an error, only the query_posts-loop doesn’t render anything.

if ( is_page_template( 'gallery.php' ) ) {
                query_posts('category_name=produktion');
                if (have_posts()) : while (have_posts()) : the_post(); 
                 $output .='

                    <li class="prodSub"><a href="#">'. get_field('prod_ens') .'</a></li>
                 ';
                 endwhile; 
                endif;
} else {
    // Returns false when 'about.php' is not being used.
            if (get_field('info_block')): $count = 0;
                 while (has_sub_field('info_block')): $count++;
               $output .='<li><a href="#infoBlock'. $count .'">' . get_sub_field('info_block_header') . '</a></li>';

                endwhile; 
            endif;
              if (get_field('ctc')): $count = 0;
                 while (has_sub_field('ctc')): $count++;
               $output .='<li><a href="#ctcItem'. $count .'">' . get_sub_field('ctc_name') . '</a></li>';

                endwhile; 
            endif;
            }
      $output .= '</ul>';

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