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-rw-r--r--elisp/geiser-debug.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/elisp/geiser-debug.el b/elisp/geiser-debug.el
index 9b60732..70f3e39 100644
--- a/elisp/geiser-debug.el
+++ b/elisp/geiser-debug.el
@@ -260,7 +260,7 @@ buffer.")
(geiser-debug--insert-res res)))
(when (or err key output)
(or (geiser-debug--display-error impl module key output)
- (insert "\n" (if key (format "%s\n" key) "") output "\n")))
+ (insert "\n" (if key (format "%s\n" key) "") (or output "") "\n")))
(when after
(goto-char (point-max))
(insert "\nExpression evaluated was:\n\n")