diff -r 81aa8aaccdd4 -r c46ec818bdd7 PLCControler.py
--- a/PLCControler.py	Sat Aug 19 16:45:37 2017 +0300
+++ b/PLCControler.py	Sat Aug 19 17:04:31 2017 +0300
@@ -1753,9 +1753,9 @@
             datatypes.extend([
                 datatype.getname()
                 for datatype in project.getdataTypes(name)
-                if (not only_locatables or self.IsLocatableDataType(datatype, debug))
+                if ((not only_locatables or self.IsLocatableDataType(datatype, debug))
                     and (name is None or
-                         len(self.GetInstanceList(datatype, name, debug)) == 0)])
+                         len(self.GetInstanceList(datatype, name, debug)) == 0))])
         if confnodetypes:
             for category in self.GetConfNodeDataTypes(name, only_locatables):
                 datatypes.extend(category["list"])