--- a/eric6/UI/UserInterface.py	Sun Jun 02 11:43:25 2019 +0200
+++ b/eric6/UI/UserInterface.py	Sun Jul 07 11:26:48 2019 +0200
@@ -5937,7 +5937,7 @@
         """
         Private slot handling the end of the external web browser process.
         """
-        self.__webBrowserProcess.deleteLater()
+        self.__webBrowserProcess and self.__webBrowserProcess.deleteLater()
         
         self.__webBrowserProcess = None
         self.__webBrowserClient = None