diff --git a/bugbot/rules/assignee_no_login.py b/bugbot/rules/assignee_no_login.py
index 456c49488..26aef6097 100644
--- a/bugbot/rules/assignee_no_login.py
+++ b/bugbot/rules/assignee_no_login.py
@@ -137,8 +137,8 @@ def get_priority_change_date(self, bug):
 
         for change in reversed(bug["history"]):
             if (
-                change["field_name"] == "priority"
-                and change["added"] == current_priority
+                change.get("field_name") == "priority"
+                and change.get("added") == current_priority
             ):
                 return datetime.strptime(change["when"], "%Y-%m-%dT%H:%M:%SZ")
         return None