Word macro to replace the paragraph marks with line break symbols

Good day,

How can I use a Replace field in JOIN comparison field

I have an SQL statement that is not allowing me to use the converted field name from a Replace. I need to use the converted field for my Join statement.

error str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated Filename: core/Output.php

Message: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated