diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 2855f3a2..5efc3582 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -21,7 +21,7 @@ Added
     - User login/logout logging signals (#1326)
     - ``createdevusers`` management command (#1339)
 - **Timeline**
-    - Empty object reference name handling in ``add_object()`` (#1338)
+    - Empty object reference name handling in ``add_object()`` (#1338, #1341)
 
 Changed
 -------
diff --git a/timeline/api.py b/timeline/api.py
index 67f192d1..c717f2ed 100644
--- a/timeline/api.py
+++ b/timeline/api.py
@@ -18,6 +18,7 @@
     ProjectEvent,
     ProjectEventObjectRef,
     EVENT_STATUS_TYPES,
+    OBJ_REF_UNNAMED,
 )
 
 
@@ -38,8 +39,10 @@ class TimelineAPI:
     # Internal Helpers ---------------------------------------------------------
 
     @classmethod
-    def _get_label(cls, label):
-        """Format label to be displayed"""
+    def _get_ref_label(cls, label):
+        """Return reference object name in displayable form"""
+        if not label:
+            return OBJ_REF_UNNAMED
         if not {' ', '-'}.intersection(label):
             return Truncator(label).chars(LABEL_MAX_WIDTH)
         return label
@@ -68,7 +71,7 @@ def _get_history_link(cls, ref_obj):
     def _get_not_found_label(cls, ref_obj):
         """Get label for object which is not found in the database"""
         return '<span class="text-danger">{}</span> {}'.format(
-            cls._get_label(ref_obj.name), cls._get_history_link(ref_obj)
+            cls._get_ref_label(ref_obj.name), cls._get_history_link(ref_obj)
         )
 
     @classmethod
@@ -85,11 +88,11 @@ def _get_project_desc(cls, ref_obj, request=None):
                     'projectroles:detail',
                     kwargs={'project': project.sodar_uuid},
                 ),
-                cls._get_label(project.title),
+                cls._get_ref_label(project.title),
             )
         elif project:
             return '<span class="text-danger">{}</span>'.format(
-                cls._get_label(project.title)
+                cls._get_ref_label(project.title)
             )
         return ref_obj.name
 
@@ -173,6 +176,13 @@ def _get_ref_description(cls, event, ref_label, app_plugin, request):
                     raise ex
                 link_data = None
             if link_data:
+                if not link_data['label']:
+                    logger.warning(
+                        'Empty label returned by plugin "{}" for object '
+                        'reference "{}" ({})"'.format(
+                            app_plugin.name, ref_obj, ref_obj.sodar_uuid
+                        )
+                    )
                 return '<a href="{}" {}>{}</a> {}'.format(
                     link_data['url'],
                     (
@@ -180,7 +190,7 @@ def _get_ref_description(cls, event, ref_label, app_plugin, request):
                         if 'blank' in link_data and link_data['blank'] is True
                         else ''
                     ),
-                    cls._get_label(link_data['label']),
+                    cls._get_ref_label(link_data['label']),
                     cls._get_history_link(ref_obj),
                 )
             else:
diff --git a/timeline/models.py b/timeline/models.py
index 1967474d..100cecf7 100644
--- a/timeline/models.py
+++ b/timeline/models.py
@@ -26,7 +26,7 @@
     'INFO': 'Info level action',
     'CANCEL': 'Action cancelled',
 }
-OBJ_REF_UNNAMED = '(Unnamed)'
+OBJ_REF_UNNAMED = '(unnamed)'
 
 
 class ProjectEventManager(models.Manager):
@@ -187,7 +187,7 @@ def add_object(self, obj, label, name, extra_data=None):
         ref.label = label
         if not name:
             logger.warning(
-                'Adding object reference with no name: {} ({})'.format(
+                'Adding object reference with no name: "{}" ({})'.format(
                     obj, getattr(obj, 'sodar_uuid')
                 )
             )