CRM Lead Magnet won't create an entry with a blank, optional field

CRM Lead Magnet won't create an entry with a blank, optional field

Hi, 

Using the CRM Lead Magnet plugin with Wordpress and Contact Form 7 to send leads into the CRM. 

I have four fields:
* First Name (required)
* Last Name (required)
* Company
* Email (required)

If all fields have data in them, then the form works fine and an entry appears in the CRM. However, If a user chooses to leave the optional 'Company' field blank then no entry is created in the CRM and no errors are shown. 

It's a bit bizarre. Anyone have a fix or is this a known issue? 

Thanks