diff --git a/tests/functional/openlp_core_ui/test_maindisplay.py b/tests/functional/openlp_core_ui/test_maindisplay.py
index 1ac6160a6..751263e06 100644
--- a/tests/functional/openlp_core_ui/test_maindisplay.py
+++ b/tests/functional/openlp_core_ui/test_maindisplay.py
@@ -271,6 +271,7 @@ class TestMainDisplay(TestCase, TestMixin):
         service_item.theme_data = MagicMock()
         service_item.theme_data.background_type = 'video'
         service_item.theme_data.theme_name = 'name'
+        service_item._raw_frames = []
         mocked_plugin = MagicMock()
         display.plugin_manager = PluginManager()
         display.plugin_manager.plugins = [mocked_plugin]