Index: C:/workspace/jython_svn/jython/bugtests/test401/to_be_executed.py
===================================================================
--- C:/workspace/jython_svn/jython/bugtests/test401/to_be_executed.py	(revision 0)
+++ C:/workspace/jython_svn/jython/bugtests/test401/to_be_executed.py	(revision 0)
@@ -0,0 +1,4 @@
+# the contents of this file are not important for bug 1758838
+
+class TestBug1758838:
+  pass
Index: C:/workspace/jython_svn/jython/bugtests/test401.py
===================================================================
--- C:/workspace/jython_svn/jython/bugtests/test401.py	(revision 0)
+++ C:/workspace/jython_svn/jython/bugtests/test401.py	(revision 0)
@@ -0,0 +1,18 @@
+# 
+# Test for bug 1758838
+#
+# execfile(<any file>) should not throw a NullPointerException
+#
+# The error only shows up in interactive interpretation (type "single" for the compilation).
+# But we cannot use InteractiveInterpreter here since it catches all Exceptions,
+# therefore we do the compilation 'by hand'.
+#
+
+from org.python.core import Py
+from org.python.core import PySystemState
+from org.python.util import PythonInterpreter
+
+PySystemState.initialize()
+interp = PythonInterpreter()
+code = Py.compile_command_flags("execfile('test401/to_be_executed.py')", "<input>", "single", None, 1)
+interp.exec(code)