I am having the same kind of problem. Tried to uninstall and reinstall the plugin, but the same problem kept appearing. I checked the error log, and it says
” PHP Deprecated: strip_tags(): Passing null to parameter #1 ($string) of type string is deprecated in /home/……../………/wp-content/plugins/Estatik-estatik-plugin-4-3ece2a158ef3/templates/front/property-pdf/partials/section.php on line 58″