Avoid error code 8023 (Password validation fail) when login with google plus

When I try to login into my app by Google Plus service with an unregistered account. The popup site leads me to an error page showing this content:

{"code":8023,"message":"Validation for the password property failed. Property value does not match the required pattern."}

I guess Backendless tried to create a new account with an empty password for me, then It got password validation error.Could anyone help me on this problem?I’m willing to remove my validation but the console doesn’t allow me to do that since I have a lot of data on Users table.

Did you assign a validator for the password property?

Yah, Sure. And It works very well with SDK.

So is it only REST API with which you receive the described error?