diff --git a/pluginHolder/urls.py b/pluginHolder/urls.py
index 5eefc03e6..4bc0c147b 100644
--- a/pluginHolder/urls.py
+++ b/pluginHolder/urls.py
@@ -99,7 +99,13 @@ urlpatterns = [
 ]
 
 # Dynamically include each installed plugin's URLs so /plugins/<plugin_name>/settings/ etc. work
+# Only include plugins that are in INSTALLED_APPS so Django can load their models.
+from django.conf import settings
+_installed_apps = getattr(settings, 'INSTALLED_APPS', ())
+
 for _plugin_name, _path_parent in _get_installed_plugin_list():
+    if _plugin_name not in _installed_apps:
+        continue
     try:
         # If plugin is from a source path, ensure it is on sys.path so import works
         if _path_parent not in sys.path: