diff --git a/jedi/api/classes.py b/jedi/api/classes.py
index be9f4bf9..9a2c9655 100644
--- a/jedi/api/classes.py
+++ b/jedi/api/classes.py
@@ -370,7 +370,7 @@ class Completion(BaseDefinition):
         super(Completion, self).__init__(evaluator, name)
 
         self._like_name_length = like_name_length
-        self.stack = stack
+        self._stack = stack
 
         # Completion objects with the same Completion name (which means
         # duplicate items in the completion)
@@ -382,9 +382,8 @@ class Completion(BaseDefinition):
                 and self.type == 'Function':
             append = '('
 
-        if self.stack is not None:
-            node_names = list(self.stack.get_node_names(self._evaluator.grammar))
-            print(node_names)
+        if isinstance(self._definition, tree.Param) and self._stack is not None:
+            node_names = list(self._stack.get_node_names(self._evaluator.grammar))
             if 'trailer' in node_names and 'argument' not in node_names:
                 append += '='
 
diff --git a/jedi/api/completion.py b/jedi/api/completion.py
index 0810ce3c..a580fe9d 100644
--- a/jedi/api/completion.py
+++ b/jedi/api/completion.py
@@ -118,13 +118,13 @@ class Completion:
                 grammar, self._code_lines, self._module, self._position
             )
         except helpers.OnErrorLeaf as e:
+            self.stack = None
             if e.error_leaf.value == '.':
                 # After ErrorLeaf's that are dots, we will not do any
                 # completions since this probably just confuses the user.
                 return []
             # If we don't have a context, just use global completion.
 
-            self.stack = None
             return self._global_completions()
 
         allowed_keywords, allowed_tokens = \