diff --git a/crc/services/study_service.py b/crc/services/study_service.py
index 795b954c..a939a67f 100644
--- a/crc/services/study_service.py
+++ b/crc/services/study_service.py
@@ -5,7 +5,7 @@ from SpiffWorkflow import WorkflowException
 from crc import db, session
 from crc.api.common import ApiError
 from crc.models.protocol_builder import ProtocolBuilderStudy, ProtocolBuilderStatus
-from crc.models.stats import WorkflowStatsModel
+from crc.models.stats import WorkflowStatsModel, TaskEventModel
 from crc.models.study import StudyModel, Study, Category, WorkflowMetadata
 from crc.models.workflow import WorkflowSpecCategoryModel, WorkflowModel, WorkflowSpecModel, WorkflowState, \
     WorkflowStatus
@@ -47,6 +47,7 @@ class StudyService(object):
     @staticmethod
     def delete_study(study_id):
         session.query(WorkflowStatsModel).filter_by(study_id=study_id).delete()
+        session.query(TaskEventModel).filter_by(study_id=study_id).delete()
         session.query(WorkflowModel).filter_by(study_id=study_id).delete()
         session.query(StudyModel).filter_by(id=study_id).delete()
 
diff --git a/tests/test_study_api.py b/tests/test_study_api.py
index 1f9c6bda..f7198966 100644
--- a/tests/test_study_api.py
+++ b/tests/test_study_api.py
@@ -6,7 +6,7 @@ from crc import session
 from crc.models.api_models import WorkflowApiSchema
 from crc.models.protocol_builder import ProtocolBuilderStatus, \
     ProtocolBuilderStudySchema
-from crc.models.stats import WorkflowStatsModel
+from crc.models.stats import WorkflowStatsModel, TaskEventModel
 from crc.models.study import StudyModel, StudySchema
 from crc.models.workflow import WorkflowSpecModel, WorkflowSpecModelSchema, WorkflowModel, WorkflowStatus, \
     WorkflowSpecCategoryModel
@@ -190,6 +190,9 @@ class TestStudyApi(BaseTest):
         stats = WorkflowStatsModel(study_id=study.id, workflow_id=workflow.id)
         session.add(stats)
         session.commit()
+        stats2 = TaskEventModel(study_id=study.id, workflow_id=workflow.id, user_uid=self.users[0]['uid'])
+        session.add(stats2)
+        session.commit()
         rv = self.app.delete('/v1.0/study/%i' % study.id, headers=self.logged_in_headers())
         self.assert_success(rv)