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-rw-r--r--library/bgerror.tcl8
1 files changed, 4 insertions, 4 deletions
diff --git a/library/bgerror.tcl b/library/bgerror.tcl
index d2b1cdc..2c43305 100644
--- a/library/bgerror.tcl
+++ b/library/bgerror.tcl
@@ -82,10 +82,10 @@ proc bgerror err {
wm withdraw $w
update idletasks
- set x [expr [winfo screenwidth $w]/2 - [winfo reqwidth $w]/2 \
- - [winfo vrootx [winfo parent $w]]]
- set y [expr [winfo screenheight $w]/2 - [winfo reqheight $w]/2 \
- - [winfo vrooty [winfo parent $w]]]
+ set x [expr {[winfo screenwidth $w]/2 - [winfo reqwidth $w]/2 \
+ - [winfo vrootx [winfo parent $w]]}]
+ set y [expr {[winfo screenheight $w]/2 - [winfo reqheight $w]/2 \
+ - [winfo vrooty [winfo parent $w]]}]
wm geom $w +$x+$y
wm deiconify $w