debug unhandled error

Author: nleush

lib/plugins/validators/async/22_imageSize.js

@@ -3,7 +3,6 @@ import { cache } from '../../../cache.js';
 import mediaPlugin from '../media.js';
 import * as urlLib from 'url';
 
-
 export default {
 
     startIteration: function(iterationPluginContext) {
@@ -98,6 +97,10 @@ export default {
 
                     // Special case: add rel image for image file with specific size.
                     if (link.rel.indexOf(CONFIG.R.image) === -1 && link.rel.indexOf(CONFIG.R.file) > -1 && data.width >= 100 && data.height >= 100) {
+                        if (typeof link.rel.push !== 'function') {
+                            throw new Error('link rel type error: "' + url + '" ' + JSON.stringify(link));
+                        }
+                            
                         link.rel.push(CONFIG.R.image);
                     }