Unhandled Error!

Trying to get property of non-object

Document	Category
Document type	CMS page
Line	12
Exception class	Cms_ExecutionException

Code Highlight

    <li><a href="/">Home</a>&#62;</li><li><a href="/">Duvets</a>&#62;</li><li class="current">Hungarian Goosedown</li>
    </ul>-->
      </div>
      <!--<div class="compareContainer"><a class="compare" href="/">Compare</a></div></div>-->
    </div>
    <div id="headerImageContainer">
        <h1 class="smudge"><?php echo $category->name; ?></h1>
     <? $image_url = $category->image_url(1, 959, 'auto'); ?>
      <? if($image_url): ?>
     <a href="/"> <img src="<?= $image_url ?>" alt="image" /></a>
      <? else : ?>
      <a href="/"><img alt="" src="<?= root_url('/resources/images/products.jpg')?>" /></a>
      <? endif?>

#	Document	Type
1	Category	CMS page