Index: sbbs.el
==================================================================
--- sbbs.el
+++ sbbs.el
@@ -289,21 +289,24 @@
 
 (defun sbbs-view-open (id)
   "Open thread ID in new buffer."
   (interactive (list (tabulated-list-get-id)))
   (let ((url (sbbs--board-url (format "/%d" id) t))
-        (headline (substring-no-properties
-                   (aref (tabulated-list-get-entry ) 2)))
+        (headline (or (and (not (tabulated-list-get-entry))
+                           header-line-format)
+                      (substring-no-properties
+                       (aref (tabulated-list-get-entry) 2))))
         (board sbbs--board)
         (buf (get-buffer-create
               (format "*loading /%s/%d*"
                       (sbbs--board-name sbbs--board)
                       id))))
     (with-current-buffer buf
       (sbbs-read-mode)
-      (setq header-line-format (format "Thread %d: %s" id headline)
-            sbbs--board board
+      (when headline
+        (setq header-line-format (format "Thread %d: %s" id headline)))
+      (setq sbbs--board board
             sbbs--thread-id id))
     (url-retrieve url #'sbbs--thread-loader (list id buf))
     (switch-to-buffer buf)))
 
 (defun sbbs-view-compose ()