Fixed bug

Author: rafaesc

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vue-docgen-api",
-  "version": "2.1.0",
+  "version": "2.1.1",
   "description": "Toolbox to extract information from Vue component files for documentation generation purposes.",
   "bugs": {
     "url": "https://github.com/vue-styleguidist/vue-docgen-api/issues"

src/utils/processProps.js

@@ -26,7 +26,9 @@ export default function processProps(docFile, component) {
 					return (comment.longname.indexOf('props.' + propName) > -1 &&
 						listDocParts.indexOf(comment.longname) === -1)
 				})[0];
-				listDocParts.push(docPart.longname);
+				if ( docPart ) {
+					listDocParts.push(docPart.longname);
+				}
 				const prop = props[propName];
 				const docProp = getProp(prop, docPart);
 				if (docProp.tags.model) {