diff --git a/blenderkit/utils.py b/blenderkit/utils.py
index 88aaa12916e1f4ba38bfb75888e601ddb46e6a4c..38e345510cc8d938bfaa59a654cbff8d5d5f4dc9 100644
--- a/blenderkit/utils.py
+++ b/blenderkit/utils.py
@@ -406,7 +406,7 @@ def copy_asset(fp1, fp2):
             target_subdir = os.path.join(target_dir, subdir.name)
             if os.path.exists(target_subdir):
                 continue
-            bk_logger.debug(subdir+' '+ target_subdir)
+            bk_logger.debug(str(subdir) +' '+ str(target_subdir))
             shutil.copytree(subdir, target_subdir)
             bk_logger.debug('copied')