lens-converter: add check for back element

Fixes elifesciences#145
pkra · Feb 25, 2016 · af383cf · af383cf
1 parent a70c60d
commit af383cf
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/converter/lens_converter.js b/converter/lens_converter.js
@@ -955,9 +955,11 @@ NlmToLensConverter.Prototype = function() {
 
     this.extractFigures(state, article);
 
-    // Extract back element
+    // Extract back element, if it exists
     var back = article.querySelector("back");
-    this.back(state,back);
+    if (back){
+        this.back(state,back);
+    }
 
     this.enhanceArticle(state, article);
   };