diff --git a/orcid-core/src/main/java/org/orcid/core/utils/v3/identifiers/resolvers/PubMedResolver.java b/orcid-core/src/main/java/org/orcid/core/utils/v3/identifiers/resolvers/PubMedResolver.java
index c2ca1adf5fb..b7dfdbb567a 100644
--- a/orcid-core/src/main/java/org/orcid/core/utils/v3/identifiers/resolvers/PubMedResolver.java
+++ b/orcid-core/src/main/java/org/orcid/core/utils/v3/identifiers/resolvers/PubMedResolver.java
@@ -206,17 +206,26 @@ private WorkExtended getWork(JSONObject json) throws JSONException, ParseExcepti
                         for (int i = 0; i < urls.length(); i++) {
                             JSONObject url = urls.getJSONObject(i);
                             // Look for html or doi links
-                            String urlType = url.getString("documentStyle");
-                            String availability = url.getString("availability");
+                            String urlType = null;
+                            if (url.has("documentStyle")) {
+                                urlType = url.getString("documentStyle");
+                            }
+                            String availability = null;
+                            if (url.has("availability")) {
+                                availability = url.getString("availability");
+                            }
+
                             // If we find the html link, use it and stop
                             // searching
-                            if (urlType.equals("html")) {
-                                if(availability == null || availability.equals("Free") || availability.equals("Open access")) {
+                            if (urlType != null) {
+                                if (urlType.equals("html")) {
+                                    if(availability == null || availability.equals("Free") || availability.equals("Open access")) {
+                                        work.setUrl(new Url(url.getString("url")));
+                                        break;
+                                    }
+                                } else if (urlType.equals("doi")) {
                                     work.setUrl(new Url(url.getString("url")));
-                                    break;
                                 }
-                            } else if (urlType.equals("doi")) {
-                                work.setUrl(new Url(url.getString("url")));
                             }
                         }
                     }