diff --git a/openlp/core/state.py b/openlp/core/state.py
index c4c6199a4..050611c69 100644
--- a/openlp/core/state.py
+++ b/openlp/core/state.py
@@ -168,7 +168,7 @@ class State(LogMixin):
         """
         plugins = []
         if a == 1:
-            assert [] == self.modules
+            assert {} == self.modules
         for mod in self.modules:
             if self.modules[mod].is_plugin:
                 plugins.append(Registry().get('{mod}_plugin'.format(mod=mod)))