diff --git a/jedi/evaluate/docstrings.py b/jedi/evaluate/docstrings.py
index 3865093d..a927abd0 100644
--- a/jedi/evaluate/docstrings.py
+++ b/jedi/evaluate/docstrings.py
@@ -18,7 +18,7 @@ annotations.
 import re
 from textwrap import dedent
 
-from parso import parse
+from parso import parse, ParserSyntaxError
 
 from jedi._compatibility import u
 from jedi.evaluate.utils import indent_block
@@ -202,7 +202,10 @@ def _evaluate_for_statement_string(module_context, string):
     # will be impossible to use `...` (Ellipsis) as a token. Docstring types
     # don't need to conform with the current grammar.
     grammar = module_context.evaluator.latest_grammar
-    module = grammar.parse(code.format(indent_block(string)))
+    try:
+        module = grammar.parse(code.format(indent_block(string)), error_recovery=False)
+    except ParserSyntaxError:
+        return []
     try:
         funcdef = next(module.iter_funcdefs())
         # First pick suite, then simple_stmt and then the node,
diff --git a/jedi/evaluate/syntax_tree.py b/jedi/evaluate/syntax_tree.py
index 76d29ae5..b89ea7aa 100644
--- a/jedi/evaluate/syntax_tree.py
+++ b/jedi/evaluate/syntax_tree.py
@@ -125,7 +125,9 @@ def eval_node(context, element):
         # Must be an ellipsis, other operators are not evaluated.
         # In Python 2 ellipsis is coded as three single dot tokens, not
         # as one token 3 dot token.
-        assert element.value in ('.', '...'), "The unhandled operator %s" % repr(element.value)
+        if element.value not in ('.', '...'):
+            origin = element.parent
+            raise AssertionError("unhandled operator %s in %s " % (repr(element.value), origin))
         return ContextSet(compiled.builtin_from_name(evaluator, u'Ellipsis'))
     elif typ == 'dotted_name':
         context_set = eval_atom(context, element.children[0])
diff --git a/test/test_evaluate/test_docstring.py b/test/test_evaluate/test_docstring.py
index 0b192701..3dfbc7af 100644
--- a/test/test_evaluate/test_docstring.py
+++ b/test/test_evaluate/test_docstring.py
@@ -196,6 +196,21 @@ def test_numpydoc_parameters_alternative_types():
     assert 'append' in names
 
 
+@pytest.mark.skipif(numpydoc_unavailable,
+                    reason='numpydoc module is unavailable')
+def test_numpydoc_invalid():
+    s = dedent('''
+    def foobar(x, y):
+        """
+        Parameters
+        ----------
+        x : int (str, py.path.local
+        """
+        x.''')
+
+    assert not jedi.Script(s).completions()
+
+
 @pytest.mark.skipif(numpydoc_unavailable,
                     reason='numpydoc module is unavailable')
 def test_numpydoc_returns():