diff --git a/tailbone/views/importing.py b/tailbone/views/importing.py
index 003d7ac4..b3358f23 100644
--- a/tailbone/views/importing.py
+++ b/tailbone/views/importing.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2022 Lance Edgar
+#  Copyright © 2010-2023 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -627,11 +627,14 @@ class ImportHandlerSchema(colander.MappingSchema):
 
 class RunJobSchema(colander.MappingSchema):
 
-    handler_spec = colander.SchemaNode(colander.String())
+    handler_spec = colander.SchemaNode(colander.String(),
+                                       missing=colander.null)
     
-    host_title = colander.SchemaNode(colander.String())
+    host_title = colander.SchemaNode(colander.String(),
+                                       missing=colander.null)
 
-    local_title = colander.SchemaNode(colander.String())
+    local_title = colander.SchemaNode(colander.String(),
+                                       missing=colander.null)
 
     models = colander.SchemaNode(colander.List())