diff -r e5f29271089d -r 109eaddc16e1 borgend/instance.py
--- a/borgend/instance.py	Tue Sep 18 18:10:03 2018 -0500
+++ b/borgend/instance.py	Tue Sep 18 18:58:19 2018 -0500
@@ -81,8 +81,10 @@
         if '_PY2APP_LAUNCHED_' in env:
             val=env['_PY2APP_LAUNCHED_']
             if val=='1':
-                del env['PYTHONPATH']
-                del env['PYTHONHOME']
+                if 'PYTHONPATH' in env:
+                    del env['PYTHONPATH']
+                if 'PYTHONHOME' in env:
+                    del env['PYTHONHOME']
 
         self.proc=Popen(cmd, env=env, stdout=PIPE, stderr=PIPE, stdin=PIPE)