For one, this was Pharo Smalltalk; a fork of Squeak that's still in beta. For another if I was shipping an application to a customer I probably wouldn't ship it with the workspace, or any of the development tools really. I would also consider buying a license for a commercial Smalltalk if that was the case.
Pharo is still maturing, but I've encountered the occasional exception.
Did this happen with the standard workspace as it was distributed? This typical smalltalk experience might be acceptable you. There is a chance though that your customers won't find it similarly enjoyable.