Php error and click trigger not working

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I’ve just noticed that my click triggered popup isn’t working. I’m having trouble figuring out what it is. I see this error using Query Monitor plugin:
Warning (Suppressed) Invalid argument supplied for foreach() 8
wp-content/plugins/popup-maker/includes/integrations/class-pum-woocommerce-integration.php:20
PUM_Woocommerce_Integration::is_wc_endpoint_url()

WP 4.9.5
WooCommerce: 3.4.1