How to Solve \'Trying to Access Array Offset on Value of Type Null\' Errors in PHP 7.4?

Addressing "Trying to Access Array Offset on Value of Type Null" Errors

In the face of PHP 7.4's heightened error detection, users of the Invoiceplane script may encounter the following error:

"Trying to access array offset on value of type null"

Identifying the Source

The error often stems from instances where $cOTLdata is null. While earlier PHP versions may have tolerated such discrepancies, PHP 7.4 enforces stricter error handling.

Troubleshooting Steps

1. Verifying Nullity: Determine whether $cOTLdata is indeed null using is_null().

2. Modifying the code:

   • For instances where only $cOTLdata['char_data'] could be null, employ the following:

     $len = is_null($cOTLdata) ? 0 : count($cOTLdata['char_data']);

   • For scenarios where both $cOTLdata and $cOTLdata['char_data'] may be null, utilize isset():

     $len = !isset($cOTLdata['char_data']) ? 0 : count($cOTLdata['char_data']);

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