Index: proto/Compiler/pablo.py
===================================================================
--- proto/Compiler/pablo.py	(revision 2215)
+++ proto/Compiler/pablo.py	(revision 2217)
@@ -64,4 +64,5 @@
   def visit_Call(self, callnode):
     self.generic_visit(callnode)
+    if len(callnode.args) == 0: return callnode
     if not isinstance(callnode.args[0], ast.Call): return callnode
     if is_BuiltIn_Call(callnode,'Advance', 1):