diff --git a/bhjwt/assertions/main.py b/bhjwt/assertions/main.py
index 9f86e28..0a59f2c 100644
--- a/bhjwt/assertions/main.py
+++ b/bhjwt/assertions/main.py
@@ -22,11 +22,16 @@ def is_data_resource_user_of(self, data_resource_id):
         self._is_data_resource_role_of(data_resource_id, "user")
 
     def _has_permission_to_data_resource(self, data_resource_id: str, permission: str) -> None:
-        data_resource_claim = self.claims["brighthive-data-resource-claims"].get(data_resource_id)
         data_perm = f"data:{permission.lower()}"
-        assertion = ("brighthive-data-resource-claims" in self.claims and
-                     data_resource_claim is not None and
-                     data_perm in data_resource_claim.get("permissions", []))
+        assertion = (
+            "brighthive-data-resource-claims" in self.claims
+            and self.claims["brighthive-data-resource-claims"].get(data_resource_id)
+            is not None
+            and permission
+            in self.claims["brighthive-data-resource-claims"]
+            .get(data_resource_id)
+            .get("permissions", [])
+        )
         self.assertions.append(assertion)
 
     def has_edit_to_data_resource(self, data_resource_id):