Deprecated : strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in C:xampphtdocsmage2rockapp\list.phtml on line 112

when i install a free template
i try to create a catagory
I end up with an error that looks like this

Exception #0 (Exception): Deprecated Functionality: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in C:xampphtdocsmage2rockappdesignfrontendHiddenapparelMagento_Catalogtemplatesproductlist.phtml on line 112

”
<div class=”product actions product-item-actions”>
<div class=”actions-primary”>”