There's no check that frame isn't #f here, and this seems to be the root of the failure I was noticing whenever popup windows were triggered (e.g., hitting the backtrace button or trying to submit a bug report).
There's no check that frame isn't #f here, and this seems to be the root of
the failure I was noticing whenever popup windows were triggered (e.g., hitting
the backtrace button or trying to submit a bug report).

svn: r18293

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket