![]() ![]() But it might be all wrapped up in some sort of abstract widget management code too it's not trivial to hunt this down unless you're lucky. I'd guess it would in turn be done with list, a widget name, etc. At a guess, it's the empty value that is passed in from the menu callback identified as: ::Vsimmenu:efaultMenuPostCmd. If cid is unexpectedly empty, you're going to be tracing it back. Check particularly if you need to say global _clients or variable _client or something like that (maybe involving upvar). The only way to work out whether _clients is right is to look at the code (which you've not shown us). In particular, we see that you were trying to read from a variable that didn't exist that means that either the _clients array isn't what you think it is, or that cid is an empty string when you don't expect it to be. You need to be a bit inventive to figure out what it means, and why the problem might be occurring. OK, you're looking at a Tcl stack trace thrown by an event callback.
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