--- a/eric6/Graphics/ApplicationDiagramBuilder.py	Mon Jun 22 17:55:06 2020 +0200
+++ b/eric6/Graphics/ApplicationDiagramBuilder.py	Tue Jun 23 17:24:18 2020 +0200
@@ -54,7 +54,6 @@
         """
         import Utilities.ModuleParser
         extensions = (
-            Preferences.getPython("PythonExtensions") +
             Preferences.getPython("Python3Extensions") +
             ['.rb']
         )