fix an issue where using hires fix with refiner on first pass with medvram would cause an exception when generating

modules/processing.py

@@ -1315,7 +1315,7 @@ class StableDiffusionProcessingTxt2Img(StableDiffusionProcessing):
             if shared.opts.hires_fix_use_firstpass_conds:
                 self.calculate_hr_conds()
 
-            elif lowvram.is_enabled(shared.sd_model):  # if in lowvram mode, we need to calculate conds right away, before the cond NN is unloaded
+            elif lowvram.is_enabled(shared.sd_model) and shared.sd_model.sd_checkpoint_info == sd_models.select_checkpoint():  # if in lowvram mode, we need to calculate conds right away, before the cond NN is unloaded
                 with devices.autocast():
                     extra_networks.activate(self, self.hr_extra_network_data)