diff --git a/src/maggotuba/models/trainers.py b/src/maggotuba/models/trainers.py
index bc1b1db75aca963396dc48a8e1fe28647f734f02..e3065cb8588f4fbd0a821cb8b42fcf30d3af09c0 100644
--- a/src/maggotuba/models/trainers.py
+++ b/src/maggotuba/models/trainers.py
@@ -386,17 +386,20 @@ def import_pretrained_model(backend, pretrained_model_instance):
     for file in pretrained_autoencoder_dir.iterdir():
         if not file.is_file():
             continue
+        logging.debug(f"copying file: {file.source}")
         dst = backend.model_dir() / file.name
         if file.name.endswith("config.json"):
             with open(file) as f:
                 config = json.load(f)
             dir = backend.model_dir().relative_to(backend.project_dir)
             config["log_dir"] = str(dir)
+            logging.debug(f"log_dir: \"{config['log_dir']}\"")
             with open(dst, "w") as f:
                 json.dump(config, f, indent=2)
             assert config_file is None
             config_file = dst
         else:
+            assert file.name != 'trained_classifier.pt'
             with open(file, "rb") as i:
                 with open(dst, "wb") as o:
                     o.write(i.read())