gitk error: can't read "pending_select": no such variable

Hello,

I have no reliable reproduction recipe for this message, but it seems to happen after Ctrl+F5 with changes.

Details are:

	can't read "pending_select": no such variable
	can't read "pending_select": no such variable
	    while executing
	"rowofcommit $pending_select"
	    (procedure "layoutmore" line 13)
	    invoked from within
	"layoutmore"
	    (procedure "chewcommits" line 5)
	    invoked from within
	"chewcommits"
	    ("eval" body line 1)
	    invoked from within
	"eval $script"
	    (procedure "dorunq" line 11)
	    invoked from within
	"dorunq"
	    ("after" script)

and that happens with Debian's gitk 1:1.7.2.3-2.2

Best regards Uwe