Fix fatal error by checking for valid order before processing webhook (…

…#4287)

* check for valid order before processing payment intent succeeded webhook

* Early return rather than throw exception.

p1653480117582769/1653399879.923419-slack-CGGCLBN58

Co-authored-by: Dat Hoang <htdat@users.noreply.github.com>

changelog/fix-4286-fix-webhook-service-fatal-error

@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Fixes fatal error on payment intent succeeded webhook.

includes/class-wc-payments-webhook-processing-service.php

@@ -361,6 +361,9 @@ private function process_webhook_payment_intent_succeeded( $event_body ) {
 		$charges_data  = $this->read_webhook_property( $event_charges, 'data' );
 		$charge_id     = $this->read_webhook_property( $charges_data[0], 'id' );
 
+		if ( ! $order ) {
+			return;
+		}
 		// update _charge_id meta if it doesn't exist - happens when maybe_process_upe_redirect fails sometimes.
 		if ( $charge_id && ! $order->get_meta( '_charge_id' ) ) {
 			$order->update_meta_data( '_charge_id', $charge_id );