diff --git a/src/calibre/ebooks/pdf/render/from_html.py b/src/calibre/ebooks/pdf/render/from_html.py
index 2cdc804a9e..08c85cc95d 100644
--- a/src/calibre/ebooks/pdf/render/from_html.py
+++ b/src/calibre/ebooks/pdf/render/from_html.py
@@ -236,6 +236,7 @@ class PDFWriter(QObject):
             except:
                 self.log.exception('Rendering failed')
                 self.loop.exit(1)
+                return
         else:
             # The document is so corrupt that we can't render the page.
             self.logger.error('Document cannot be rendered.')