diff --git a/tests/test_workflows.py b/tests/test_workflows.py
index 400b2366f..ecc3401c5 100644
--- a/tests/test_workflows.py
+++ b/tests/test_workflows.py
@@ -3103,6 +3103,26 @@ def test_workflow_display_message_line_details(pub):
     assert display_message.get_line_details() == 'with actions, for foorole'
 
 
+def test_workflow_email_line_details(pub):
+    workflow = Workflow(name='email')
+    st1 = workflow.add_status('Status1', 'st1')
+    sendmail = SendmailWorkflowStatusItem()
+    sendmail.parent = st1
+
+    assert sendmail.get_line_details() == 'not completed'
+
+    role = pub.role_class(name='foorole')
+    role.store()
+    sendmail.to = [role.id]
+    assert sendmail.get_line_details() == 'to foorole'
+
+    sendmail.to = ['test@example.net']
+    assert sendmail.get_line_details() == 'to test@example.net'
+
+    sendmail.to = ['{{ foobar }}']
+    assert sendmail.get_line_details() == 'to computed value'
+
+
 def test_workflow_roles(pub, emails):
     pub.substitutions.feed(MockSubstitutionVariables())
 
diff --git a/wcs/workflows.py b/wcs/workflows.py
index 33c4cb34d..b89a0e73f 100644
--- a/wcs/workflows.py
+++ b/wcs/workflows.py
@@ -2816,7 +2816,7 @@ class SendmailWorkflowStatusItem(WorkflowStatusItem):
                 role_label = get_role_translation_label(self.parent.parent, r)
                 if role_label:
                     t.append(role_label)
-        return ', '.join(t)
+        return ', '.join([str(x) for x in t])
 
     def get_to_parameter_view_value(self):
         return self.render_list_of_roles_or_emails(self.to)