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-rw-r--r--lisp/emacs-lisp/debug.el1
1 files changed, 1 insertions, 0 deletions
diff --git a/lisp/emacs-lisp/debug.el b/lisp/emacs-lisp/debug.el
index e002dbabe49..6fd52d67b90 100644
--- a/lisp/emacs-lisp/debug.el
+++ b/lisp/emacs-lisp/debug.el
@@ -166,6 +166,7 @@ first will be printed into the backtrace buffer."
(with-current-buffer (get-buffer "*Backtrace*")
(list major-mode (buffer-string)))))
(debugger-buffer (get-buffer-create "*Backtrace*"))
+ (debugger-old-buffer (current-buffer))
(debugger-window nil)
(debugger-step-after-exit nil)
(debugger-will-be-back nil)