Add safety check on content

Author: sivakumar-kailasam

lib/yuidoc-fixer/normalize-yui-doc-class-item.js

@@ -31,7 +31,7 @@ export const normalizeYuiDocClassItem = item => {
 				}
 
 				// For cases where we have @decorator(args), other cases are @decorator x
-				if (!content.startsWith('(')) {
+				if (typeof content === 'string' && !content.startsWith('(')) {
 					content = ' ' + content
 				}