diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index 103f5ca0..822f0dde 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -234,7 +234,13 @@ class Evaluator(object):
             elif trailer_op == '(':
                 new_types += self.execute(typ, node)
             elif trailer_op == '[':
-                new_types += typ.get_index_types(node)
+                try:
+                    get = typ.get_index_types
+                except AttributeError:
+                    debug.warning("TypeError: '%s' object is not subscriptable"
+                                  % typ)
+                else:
+                    new_types += get(self, node)
         return new_types
 
     @debug.increase_indent
diff --git a/jedi/evaluate/param.py b/jedi/evaluate/param.py
index 9fa31247..2e107147 100644
--- a/jedi/evaluate/param.py
+++ b/jedi/evaluate/param.py
@@ -161,7 +161,8 @@ def get_params(evaluator, func, var_args):
         param_dict[str(param.get_name())] = param
     # There may be calls, which don't fit all the params, this just ignores it.
     #unpacked_va = _unpack_var_args(evaluator, var_args, func)
-    var_arg_iterator = common.PushBackIterator(iter(var_args.unpack()))
+    unpacked_va = var_args.unpack()
+    var_arg_iterator = common.PushBackIterator(iter(unpacked_va))
 
     non_matching_keys = []
     keys_used = set()