diff --git a/dotdrop/cfg_aggregator.py b/dotdrop/cfg_aggregator.py
index ecc3d9c..70e368c 100644
--- a/dotdrop/cfg_aggregator.py
+++ b/dotdrop/cfg_aggregator.py
@@ -404,6 +404,8 @@ class CfgAggregator:
             return None
 
     def _norm_path(self, path):
+        if not path:
+            return path
         path = os.path.expanduser(path)
         path = os.path.expandvars(path)
         path = os.path.abspath(path)