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-rw-r--r--generic/proof-script.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/generic/proof-script.el b/generic/proof-script.el
index 3d07a9ac..6aae642c 100644
--- a/generic/proof-script.el
+++ b/generic/proof-script.el
@@ -1636,7 +1636,8 @@ finish setup which depends on specific proof assistant configuration."
;; NB: call to file-truename is needed for FSF Emacs which
;; chooses to make buffer-file-truename abbreviate-file-name
;; form of file-truename.
- (and (member (file-truename buffer-file-truename)
+ (and buffer-file-truename
+ (member (file-truename buffer-file-truename)
proof-included-files-list)
(proof-mark-buffer-atomic (current-buffer)))