diff --git a/orcid-core/src/main/java/org/orcid/pojo/DigestEmail.java b/orcid-core/src/main/java/org/orcid/pojo/DigestEmail.java
index 4d16a9caf40..ba2a526fb89 100644
--- a/orcid-core/src/main/java/org/orcid/pojo/DigestEmail.java
+++ b/orcid-core/src/main/java/org/orcid/pojo/DigestEmail.java
@@ -27,7 +27,7 @@ public void addNotification(Notification notification) {
             sourceId = source.retrieveSourcePath();
         }
 
-        if (source != null && source.getSourceName().getContent() != null &&
+        if (source != null && source.getSourceName() != null && source.getSourceName().getContent() != null &&
                 !sources.contains(source.getSourceName().getContent())) {
             sources.add(source.getSourceName().getContent());
         }