diff --git a/nionswift_plugin/nion_eels_analysis/AlignZLP.py b/nionswift_plugin/nion_eels_analysis/AlignZLP.py
index 72e8ac8..0e5128e 100755
--- a/nionswift_plugin/nion_eels_analysis/AlignZLP.py
+++ b/nionswift_plugin/nion_eels_analysis/AlignZLP.py
@@ -254,6 +254,8 @@ def __second_graphic_changed(self, property_name: str) -> None:
 
     class DummyHandler:
         def close(self) -> None: pass
+        def get_object_converter(self, item: typing.Any) -> typing.Callable[..., Facade.ObjectConverter]:
+            return lambda c: Facade.ObjectConverter(item, c)
 
     if not data_item or not data_item.display_xdata or not data_item.display_xdata.is_data_1d: