check if $code_user_id is null

strangerstudios / pmpro-sponsored-members

Generate a discount code for a main account holder to distribute to sponsored members.

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Closed ipokkel closed 3 years ago

ipokkel commented 3 years ago

[ ] Have you followed the Contributing guideline?
[ ] 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?

Check if $code_user_id variable has a valide comparable value before comparing to current user ID. Resolves issue 86.