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There are 2 possible solutions:
1. No category in the module has been selected
2. Or add a checking condition in the template (categories_homepage.tpl)

{if isset($selectedCategoryCount)}
     {foreach $selectedCategories as $category}
         ....
     {/foreach}
{/if}

There are 2 possible solutions:
1. No category in the module has been selected
2. Or add a checking condition in the template (categories_homepage.tpl)

{if isset($selectedCategoryCount)}
     {foreach $selectedCategories as $category}
         ....
     {/foreach}
{if}