Problem with Sumif, and blank cells

Hi All

I need help with below please,

I am trying to do sumif on below

A B C Total that I need to achieve
-520 Check [blank] -520
-321 Check -321 0


Criteria
Sumif B2 have "Check" add A2 then -C2 Problem is C2 although shows no value, there is formula that returns Blank Value.

Please see attached file.

Thank you for your help

Chirayu