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-rw-r--r--lisp/subr.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/subr.el b/lisp/subr.el
index f82826e819c..cf6500d32c7 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -3540,7 +3540,8 @@ confusing to some users.")
(defun use-dialog-box-p ()
"Say whether the current command should prompt the user via a dialog box."
(and last-input-event ; not during startup
- (or (listp last-nonmenu-event) ; invoked by a mouse event
+ (or (and last-nonmenu-event ; nil is listp...
+ (listp last-nonmenu-event)) ; invoked by a mouse event
from--tty-menu-p) ; invoked via TTY menu
use-dialog-box))