Add similar check to class-universal

projects/packages/woocommerce-analytics/src/class-universal.php

@@ -9,6 +9,7 @@
 
 use WC_Order;
 use WC_Product;
+use WP_Post;
 
 /**
  * Filters and Actions added to Store pages to perform analytics
@@ -209,6 +210,12 @@ public function get_shipping_option_for_item( $cart_item_key ) {
 	 * On the Checkout page, trigger an event for each product in the cart
 	 */
 	public function checkout_process() {
+		global $post;
+
+		if ( ! $post instanceof WP_Post ) {
+			return;
+		}
+
 		$checkout_page_id    = wc_get_page_id( 'checkout' );
 		$cart                = WC()->cart->get_cart();
 		$is_in_checkout_page = $checkout_page_id && is_page( $checkout_page_id ) ? 'Yes' : 'No';