diff --git a/test/90_1_prm/test_appendix_g_prm.rb b/test/90_1_prm/test_appendix_g_prm.rb
index cf40bea107..30fea3b122 100644
--- a/test/90_1_prm/test_appendix_g_prm.rb
+++ b/test/90_1_prm/test_appendix_g_prm.rb
@@ -2794,6 +2794,7 @@ def change_bldg_type(model, arguments)
   # @param model [OpenStudio::model::Model] OpenStudio model object
   # @param arguments [Array] List of arguments
   def remove_transformer(model, arguments)
+    assert(model, 'Unsuccessfully generating the model')
     model.getElectricLoadCenterTransformers.each(&:remove)
     return model
   end