From 287c406450dd9c1fd93b40cf19d2058f2f363302 Mon Sep 17 00:00:00 2001
From: Matthias Mair <code@mjmair.com>
Date: Mon, 13 Feb 2023 22:03:25 +0100
Subject: [PATCH] only run (de)activation if defined for mixin Fixes #4184

---
 InvenTree/plugin/registry.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/InvenTree/plugin/registry.py b/InvenTree/plugin/registry.py
index c2f63b9bf0..4c8693aa93 100644
--- a/InvenTree/plugin/registry.py
+++ b/InvenTree/plugin/registry.py
@@ -470,13 +470,15 @@ class PluginsRegistry:
         logger.info(f'Found {len(plugins)} active plugins')
 
         for mixin in self.mixin_order:
-            mixin._activate_mixin(self, plugins, force_reload=force_reload, full_reload=full_reload)
+            if hasattr(mixin, '_activate_mixin'):
+                mixin._activate_mixin(self, plugins, force_reload=force_reload, full_reload=full_reload)
 
     def _deactivate_plugins(self):
         """Run deactivation functions for all plugins."""
 
         for mixin in self.mixin_order:
-            mixin._deactivate_mixin(mixin)
+            if hasattr(mixin, '_deactivate_mixin'):
+                mixin._deactivate_mixin(mixin)
     # endregion
 
     # region mixin specific loading ...