diff --git a/src/calibre/gui2/viewer/main.py b/src/calibre/gui2/viewer/main.py
index bf34014fb3..7d8b9bc6a5 100644
--- a/src/calibre/gui2/viewer/main.py
+++ b/src/calibre/gui2/viewer/main.py
@@ -1094,7 +1094,9 @@ class EbookViewer(MainWindow):
                                 if index.isValid():
                                     target_index = index
                                     break
-                        if target_index is not None:
+                        if target_index is None:
+                            self.next_document()
+                        else:
                             if self.resize_in_progress:
                                 self.pending_toc_click = target_index
                             else: