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TWIG errors after upgrade to PHP 8

We have a D9 site running on Acquia. It uses a Bootstrap based subtheme. When we upgraded PHP from 7.4 to 8 we get this error:

TypeError: Unsupported operand types: string - null in __TwigTemplate_0256ea2515fa880b0671f8a508ce41f69921e50f3e6fa4ddf6cb0a079db2e987->block_navbar() (line 95 of /mnt/tmp/insidescienced8ide/php_storage/twig/twig/62b4874a2f4bf_page.html.twig_cAlraWEWb4deXlEGXnzn_mlxi/MCicmo0uhbkPC0ZydVY1-_R8TO4AX5CJbKuJplq5fCM.php).

This is what I think is the relevant section of the TWIG template:

 {% if not navbar_attributes.hasClass(container) %}     <div class="{{ container }}">   {% endif %}

Any ideas would be appreciated.

This article was republished from its original source.
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TWIG errors after upgrade to PHP 8

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