diff --git a/InvenTree/common/notifications.py b/InvenTree/common/notifications.py
index e52e2d86ff..c32ee3ec82 100644
--- a/InvenTree/common/notifications.py
+++ b/InvenTree/common/notifications.py
@@ -336,9 +336,9 @@ def trigger_notification(obj, category=None, obj_ref='pk', **kwargs):
 
     # Try with some defaults
     if not obj_ref_value:
-        obj_ref_value = getattr(obj, 'pk')
+        obj_ref_value = getattr(obj, 'pk', None)
     if not obj_ref_value:
-        obj_ref_value = getattr(obj, 'id')
+        obj_ref_value = getattr(obj, 'id', None)
     if not obj_ref_value:
         raise KeyError(f"Could not resolve an object reference for '{str(obj)}' with {obj_ref}, pk, id")
 
diff --git a/InvenTree/plugin/base/integration/APICallMixin.py b/InvenTree/plugin/base/integration/APICallMixin.py
index 7fa6a43d25..1dcef4dc61 100644
--- a/InvenTree/plugin/base/integration/APICallMixin.py
+++ b/InvenTree/plugin/base/integration/APICallMixin.py
@@ -93,7 +93,7 @@ class APICallMixin:
         Check the mixin class docstring for a full example.
         """
         headers = {'Content-Type': 'application/json'}
-        if getattr(self, 'API_TOKEN_SETTING'):
+        if getattr(self, 'API_TOKEN_SETTING', None):
             token = self.get_setting(self.API_TOKEN_SETTING)
 
             if token:
diff --git a/InvenTree/plugin/models.py b/InvenTree/plugin/models.py
index 44f281cf02..fef716b86a 100644
--- a/InvenTree/plugin/models.py
+++ b/InvenTree/plugin/models.py
@@ -189,7 +189,7 @@ class PluginSetting(common.models.BaseInvenTreeSetting):
             plugin = kwargs.pop('plugin', None)
 
             if plugin:
-                mixin_settings = getattr(registry, 'mixins_settings')
+                mixin_settings = getattr(registry, 'mixins_settings', None)
                 if mixin_settings:
                     kwargs['settings'] = mixin_settings.get(plugin.key, {})