Issue with paragraphs, Drupal\media_entity_instagram\Plugin\media\Source\Instagram::matchRegexp and first()

Finding an issue with this module in our particular instance.

Recreation:
Create a paragraph with instagram field
Create a different paragraph type, something simple ideally for testing.
Have a content type with a field allowing both of the previous paragraphs types.
Create a piece of content of the new content type, add instagram paragraph
Attempt to add another paragraph. Ajax fails, and you get an error: cannot call method mainPropertyName() on null.

Cause:

You can't rely on first, ever. Always sanity check first exists.

$property_name = $media->{$source_field}->first()->mainPropertyName();

Anytime you use first, and haven't sanity checked it, you run the risk that first() returns null and then you're trying to access a method on NULL.

There is likely a larger issue at play here. Why source field fails, why it's getting null, why all of that is happening I don't know at this time. For now, for my purposes, simply adding a sanity check works.