diff --git a/app/src/main/java/com/murrayc/galaxyzoo/app/syncadapter/SubjectAdder.java b/app/src/main/java/com/murrayc/galaxyzoo/app/syncadapter/SubjectAdder.java
index 46608644..4d3ef90e 100644
--- a/app/src/main/java/com/murrayc/galaxyzoo/app/syncadapter/SubjectAdder.java
+++ b/app/src/main/java/com/murrayc/galaxyzoo/app/syncadapter/SubjectAdder.java
@@ -63,6 +63,8 @@ public SubjectAdder(final Context context, final RequestQueue requestQueue) {
     boolean downloadMissingImages() {
         boolean noWorkNeeded = true;
 
+        throwIfNoNetwork();
+
         //Get all the items that have an image that is not yet fully downloaded:
         final ContentResolver resolver = getContext().getContentResolver();