diff --git a/tailbone/views/shifts/schedule.py b/tailbone/views/shifts/schedule.py
index 21952fbc..02aae21b 100644
--- a/tailbone/views/shifts/schedule.py
+++ b/tailbone/views/shifts/schedule.py
@@ -60,41 +60,44 @@ class ScheduleView(TimeSheetView):
                         if uuid:
                             data[field][uuid] = self.request.POST[key]
 
-            # apply delete operations
-            deleted = []
-            for uuid, value in data['delete'].iteritems():
-                assert value == 'delete'
-                shift = Session.query(model.ScheduledShift).get(uuid)
-                assert shift
-                Session.delete(shift)
-                deleted.append(uuid)
+            # if no fields, don't apply changes (filter form uses POST also)
+            if any(data.itervalues()):
 
-            # apply create / update operations
-            created = {}
-            updated = {}
-            time_format = '%a %d %b %Y %I:%M %p'
-            for uuid, employee_uuid in data['start_time'].iteritems():
-                if uuid in deleted:
-                    continue
-                if uuid.startswith('new-'):
-                    shift = model.ScheduledShift()
-                    shift.employee_uuid = data['employee_uuid'][uuid]
-                    shift.store_uuid = data['store_uuid'][uuid]
-                    Session.add(shift)
-                    created[uuid] = shift
-                else:
+                # apply delete operations
+                deleted = []
+                for uuid, value in data['delete'].iteritems():
+                    assert value == 'delete'
                     shift = Session.query(model.ScheduledShift).get(uuid)
                     assert shift
-                    updated[uuid] = shift
-                start_time = datetime.datetime.strptime(data['start_time'][uuid], time_format)
-                shift.start_time = make_utc(localtime(self.rattail_config, start_time))
-                end_time = datetime.datetime.strptime(data['end_time'][uuid], time_format)
-                shift.end_time = make_utc(localtime(self.rattail_config, end_time))
+                    Session.delete(shift)
+                    deleted.append(uuid)
 
-            self.request.session.flash("Changes were applied: created {}, updated {}, "
-                                       "deleted {} Scheduled Shifts".format(
-                                           len(created), len(updated), len(deleted)))
-            return self.redirect(self.request.route_url('schedule.edit'))
+                # apply create / update operations
+                created = {}
+                updated = {}
+                time_format = '%a %d %b %Y %I:%M %p'
+                for uuid, employee_uuid in data['start_time'].iteritems():
+                    if uuid in deleted:
+                        continue
+                    if uuid.startswith('new-'):
+                        shift = model.ScheduledShift()
+                        shift.employee_uuid = data['employee_uuid'][uuid]
+                        shift.store_uuid = data['store_uuid'][uuid]
+                        Session.add(shift)
+                        created[uuid] = shift
+                    else:
+                        shift = Session.query(model.ScheduledShift).get(uuid)
+                        assert shift
+                        updated[uuid] = shift
+                    start_time = datetime.datetime.strptime(data['start_time'][uuid], time_format)
+                    shift.start_time = make_utc(localtime(self.rattail_config, start_time))
+                    end_time = datetime.datetime.strptime(data['end_time'][uuid], time_format)
+                    shift.end_time = make_utc(localtime(self.rattail_config, end_time))
+
+                self.request.session.flash("Changes were applied: created {}, updated {}, "
+                                           "deleted {} Scheduled Shifts".format(
+                                               len(created), len(updated), len(deleted)))
+                return self.redirect(self.request.route_url('schedule.edit'))
 
         form = Form(self.request, schema=ShiftFilter)
         self.process_filter_form(form)