9341-warning-due-to-unhandled-possible-return-value

[duotive]

Fixes #9341

Changes proposed in this Pull Request

When going through checkout without a payment method, the plugin throws the following warning:

PHP Warning:  Attempt to read property "id" on bool in /home/public_html/wp-content/plugins/woocommerce-payments/includes/class-woopay-tracker.php on line 546

Testing instructions

• create a coupon that has a big value, and will enable free shipping on checkout
• add a product to checkout, and apply the coupon created
• when completing the checkout the total sum to pay should be 0

---

• Run npm run changelog to add a changelog file, choose patch to leave it empty if the change is not significant. You can add multiple changelog files in one PR by running this command a few times.
• Covered with tests (or have a good reason not to test in description ☝️)
• Tested on mobile (or does not apply)

Post merge

• Link to testing instructions from release testing doc following these instructions : Add link here / 'QA Testing Not Applicable'
• Add or update critical flows and testing instructions for critical flows, if applicable.
• Add what's changed (description, screenshot, demo videos etc.) to the release announcement post, if applicable.

[retrofox]

what about checking if the variable is string?

Suggested change

	if ( $payment_gateway && strpos( $payment_gateway->id, 'woocommerce_payments' ) === 0 ) {
	if ( is_string( $payment_gateway ) && strpos( $payment_gateway->id, 'woocommerce_payments' ) === 0 ) {