diff --git a/lib/galaxy/jobs/handler.py b/lib/galaxy/jobs/handler.py
index 3d7d1869b1ab..d7720bcaf00d 100644
--- a/lib/galaxy/jobs/handler.py
+++ b/lib/galaxy/jobs/handler.py
@@ -212,7 +212,7 @@ def __monitor_step( self ):
                 .join(model.LibraryDatasetDatasetAssociation) \
                 .join(model.Dataset) \
                 .filter(and_((model.Job.state == model.Job.states.NEW),
-                        or_((model.LibraryDatasetDatasetAssociation._state is not None),
+                        or_((model.LibraryDatasetDatasetAssociation._state != null()),
                             (model.LibraryDatasetDatasetAssociation.deleted == true()),
                             (model.Dataset.state != model.Dataset.states.OK),
                             (model.Dataset.deleted == true())))).subquery()