[Emacs-diffs] emacs-26 82d4b98: Avoid errors in Auto Revert mode

[Eli Zaretskii]

branch: emacs-26
commit 82d4b9872fe848db8645b4ed3c11944f28bcdb79
Author: Eli Zaretskii <address@hidden>
Commit: Eli Zaretskii <address@hidden>

    Avoid errors in Auto Revert mode
    
    * lisp/autorevert.el (auto-revert-buffers): Cancel
    auto-revert-timer only if it is non-nil.  This avoids errors
    on first invocation of Auto-Revert mode.
---
 lisp/autorevert.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/autorevert.el b/lisp/autorevert.el
index d1b8f94..242344f 100644
--- a/lisp/autorevert.el
+++ b/lisp/autorevert.el
@@ -813,7 +813,8 @@ the timer when no buffers need to be checked."
       ;; Check if we should cancel the timer.
       (when (and (not global-auto-revert-mode)
                 (null auto-revert-buffer-list))
-       (cancel-timer auto-revert-timer)
+        (if (timerp auto-revert-timer)
+            (cancel-timer auto-revert-timer))
        (setq auto-revert-timer nil)))))