From 783738903423bd07770975955bfde2b8ca07aeed Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 3 Dec 2021 07:39:20 +0530
Subject: [PATCH] Better error message when trying to print book with no book
 open

---
 src/calibre/gui2/viewer/ui.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/calibre/gui2/viewer/ui.py b/src/calibre/gui2/viewer/ui.py
index c74b55ac80..92c97f0438 100644
--- a/src/calibre/gui2/viewer/ui.py
+++ b/src/calibre/gui2/viewer/ui.py
@@ -428,6 +428,9 @@ class EbookViewer(MainWindow):
         error_dialog(self, title, msg, det_msg=details or None, show=True)
 
     def print_book(self):
+        if not hasattr(set_book_path, 'pathtoebook'):
+            error_dialog(self, _('Cannot print book'), _(
+                'No book is currently open'), show=True)
         from .printing import print_book
         print_book(set_book_path.pathtoebook, book_title=self.current_book_data['metadata']['title'], parent=self)