Problem using Proxy Login

Currently if I try to run a script in Toad using Quest Script Runner I get an ORA-01005: null password given; logon denied error. After I acknowledge this error I am able to enter my proxy password. Is there a grant my proxy user needs to prevent this error from occurring? This same error appears to be happening when I try to run SQL Loader.

which version of Toad is this?

I am using version 12.0.0.61

It was fixed in version 12.12

Thanks for the update. I have upgraded to version 13.2.0.258.