diff --git a/meta/lib/oe/sbom30.py b/meta/lib/oe/sbom30.py
index 0926266295..28778651d5 100644
--- a/meta/lib/oe/sbom30.py
+++ b/meta/lib/oe/sbom30.py
@@ -180,6 +180,9 @@ def hash_id(_id):
 
 
 def to_list(l):
+    if l is None:
+        return None
+
     if isinstance(l, set):
         l = sorted(list(l))