diff --git a/jedi/evaluate/pep0484.py b/jedi/evaluate/pep0484.py
index e31e842a..cb3e8a4c 100644
--- a/jedi/evaluate/pep0484.py
+++ b/jedi/evaluate/pep0484.py
@@ -29,7 +29,10 @@ def _evaluate_for_annotation(evaluator, annotation):
             if (isinstance(definition, CompiledObject) and
                     isinstance(definition.obj, str)):
                 p = Parser(load_grammar(), definition.obj)
-                element = p.module.children[0].children[0]
+                try:
+                    element = p.module.children[0].children[0]
+                except (AttributeError, IndexError):
+                    continue
                 element.parent = annotation.parent
                 definitions |= evaluator.eval_element(element)
             else:
diff --git a/test/completion/pep0484.py b/test/completion/pep0484.py
index d49f8c58..d6ec8291 100644
--- a/test/completion/pep0484.py
+++ b/test/completion/pep0484.py
@@ -114,14 +114,23 @@ SelfReference().test_method()
 def function_with_non_pep_0484_annotation(
         x: "I can put anything here",
         xx: "",
-        yy: "\r\n;+*&^564835(---^&*34",
-        y: 3 + 3) -> int("42"):
+        yy: "\r\n\0;+*&^564835(---^&*34",
+        y: 3 + 3,
+        zz: float) -> int("42"):
     # infers int from function call
     #? int()
     x
+    # infers int from function call
+    #? int()
+    xx
+    # infers int from function call
+    #? int()
+    yy
     # infers str from function call
     #? str()
     y
+    #? float()
+    zz
 #?
 function_with_non_pep_0484_annotation(1, 2, 3, "force string")