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-rw-r--r--lisp/iswitchb.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/iswitchb.el b/lisp/iswitchb.el
index 0b283d0ae77..d24f737851b 100644
--- a/lisp/iswitchb.el
+++ b/lisp/iswitchb.el
@@ -1260,7 +1260,8 @@ Modified from `icomplete-completions'."
;; put in common completion item -- what you get by
;; pressing tab
- (if (> (length iswitchb-common-match-string) (length name))
+ (if (and (stringp iswitchb-common-match-string)
+ (> (length iswitchb-common-match-string) (length name)))
(concat open-bracket-determined
(substring iswitchb-common-match-string
(length name))