Avoid notice when $post is undefined

strangerstudios / pmpro-gift-levels

Allow members to purchase gift codes for membership at checkout.

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Closed mircobabini closed 3 years ago

mircobabini commented 3 years ago

[x] Have you followed the Contributing guideline?
[x] Does your code follow the WordPress' coding standards?
[x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Avoid PHP Notice: Trying to get property 'ID' of non-object in /wp-content/plugins/pmpro-gift-levels/pmpro-gift-levels.php on line 218