diff --git a/src/babel/types/index.js b/src/babel/types/index.js
index de5e5a7773..30d510508b 100644
--- a/src/babel/types/index.js
+++ b/src/babel/types/index.js
@@ -278,6 +278,8 @@ export function inheritsComments(child: Object, parent: Object): Object {
  */
 
 export function inherits(child: Object, parent: Object): Object {
+  if (!child || !parent) return child;
+
   child._declarations = parent._declarations;
   child._scopeInfo    = parent._scopeInfo;
   child.range         = parent.range;