Invalid salt Parameter name: salt in BCrypt on c#

Question

I have a problem when i login into my application in c# using MySQL
database, when my username and password is correct there is no problem
and when just username is correct and password is wrong there is no
problem but when my username is incorrect it give me this error on my
BCrypt method for verify the password it say System.ArgumentException:
'Invalid salt Parameter name: salt', like this image:
and this is my class for BCrypt:

Priyankar Dutta · Answer

Facing same issue - did you manage to figure out why this happens?

Laxmidhar Sahoo · Answer

hey   You should first check the user whether exxist or not .Because the users stored internally and when check hashing could not find the user and force to error.   Otherwise place your code in try catchblock