diff --git a/cloudinit/sources/DataSourceOracle.py b/cloudinit/sources/DataSourceOracle.py
index 5abc3dbd..09bb05b8 100644
--- a/cloudinit/sources/DataSourceOracle.py
+++ b/cloudinit/sources/DataSourceOracle.py
@@ -252,7 +252,7 @@ def _get_data(self):
             "name": data["displayName"],
         }
 
-        if "metadata" in data:
+        if "metadata" in data and data["metadata"] is not None:
             user_data = data["metadata"].get("user_data")
             if user_data:
                 self.userdata_raw = base64.b64decode(user_data)