Solution to PHP Fatal Error td-subscription/includes/td_subscription.php:3276 ?

I have experienced three fatal errors using third party plugins, and on every occasion the cause has been Line 3276 in td_subscription.php.

However I think I have found the answer, and I have tested it with all three plugins on three different websites, and even a brand new website with all three plugins installed together. Before implementing this fix I confirmed all the websites failed with the ‘conflicting’ plugins installed, and then activated the solution below.

A function is trying to use array_key_exists() on a variable that is null instead of an array.

**How to fix:**
– The plugin author should ensure that the second argument to array_key_exists() is always an array.
– As a quick fix, you can wrap the call with an is_array() check.

**Example fix:**
**Remember that the source file location is \td-subscription\includes\td_subscription.php**
`php
if (is_array($array) && array_key_exists($key, $array)) {
// ...existing code...
}`

I am having the same issue.
When will the “Fatal Error Line 3276” be corrected in the plug-in: tagDiv Opt-In Builder?
Thank You