diff --git a/awx/api/serializers.py b/awx/api/serializers.py
index 00a90b2653..3c3fcf41b6 100644
--- a/awx/api/serializers.py
+++ b/awx/api/serializers.py
@@ -4801,17 +4801,17 @@ class InstanceGroupSerializer(BaseSerializer):
                 raise serializers.ValidationError(_('Isolated instances may not be added or removed from instances groups via the API.'))
             if self.instance and self.instance.controller_id is not None:
                 raise serializers.ValidationError(_('Isolated instance group membership may not be managed via the API.'))
-        if value and self.instance.is_containerized:
+        if value and self.instance and self.instance.is_containerized:
             raise serializers.ValidationError(_('Containerized instances may not be managed via the API'))
         return value
 
     def validate_policy_instance_percentage(self, value):
-        if value and self.instance.is_containerized:
+        if value and self.instance and self.instance.is_containerized:
             raise serializers.ValidationError(_('Containerized instances may not be managed via the API'))
         return value
 
     def validate_policy_instance_minimum(self, value):
-        if value and self.instance.is_containerized:
+        if value and self.instance self.instance.is_containerized:
             raise serializers.ValidationError(_('Containerized instances may not be managed via the API'))
         return value