diff --git a/feedleware/openalex/openalex.py b/feedleware/openalex/openalex.py
index 447bd6a..b8e3726 100644
--- a/feedleware/openalex/openalex.py
+++ b/feedleware/openalex/openalex.py
@@ -141,7 +141,10 @@ class APIClient:
                     sorted(abstract_forward.items()),
                 ))
 
-            if work["primary_location"]["source"] is not None:
+            if (
+                work["primary_location"] is not None
+                and work["primary_location"]["source"] is not None
+            ):
                 source = work["primary_location"]["source"]["display_name"]
 
             results.append({