Application Error: bad window path name ".dialog"

[dwisehart]

On MacOS running the Docker image, I opened a cell named pair2.mag and immediately did cell->save as... because I wanted to make a copy and then make some changes. Magic told me the new filename--pair.mag--already existed, did I want to overwrite it. I said yes, and I can see the operation succeeded, but then a dialog popped up with an error, which I saved off to a log file. Here is the error:

bad window path name ".dialog"
bad window path name ".dialog"
while executing
"lower .dialog"
invoked from within
".dialog.bbar.okay invoke"
("uplevel" body line 1)
invoked from within
"uplevel #0 [list $w invoke]"
(procedure "tk::ButtonUp" line 22)
invoked from within
"tk::ButtonUp .dialog.bbar.okay"
(command bound to event)

[RTimothyEdwards]

That's very weird. It called .dialog.bbar.invoke from the .dialog window and then claims that .dialog doesn't exist. My only explanation for this is that it is probably related to docker and somehow the dialog window got removed before Tk could handle it; on that assumption I could replace lower .dialog with catch {lower .dialog} which should work around the issue.