diff --git a/src/js/simplemde.js b/src/js/simplemde.js
index 555af9d..9ba9d14 100644
--- a/src/js/simplemde.js
+++ b/src/js/simplemde.js
@@ -879,7 +879,7 @@ function SimpleMDE(options) {
 
 
 	// Change unique_id to uniqueId for backwards compatibility
-	if(options.autosave.unique_id != undefined && options.autosave.unique_id != "")
+	if(options.autosave != undefined && options.autosave.unique_id != undefined && options.autosave.unique_id != "")
 		options.autosave.uniqueId = options.autosave.unique_id;