diff --git a/src/pynxtools/dataconverter/readers/multi/reader.py b/src/pynxtools/dataconverter/readers/multi/reader.py
index da19b0139..4a11f5db7 100644
--- a/src/pynxtools/dataconverter/readers/multi/reader.py
+++ b/src/pynxtools/dataconverter/readers/multi/reader.py
@@ -50,7 +50,12 @@ def get_vals_on_same_level(key):
     dim_dict = {}
     for dim in dims:
         new_key = key.replace("*", dim)
-        new_val = value.replace("*", dim)
+        if isinstance(value, str):
+            new_val = value.replace("*", dim)
+        elif isinstance(value, list):
+            new_val = [val.replace("*", dim) for val in value]
+        else:
+            new_val = value
 
         if new_key not in config_file_dict and new_val not in get_vals_on_same_level(
             new_key
@@ -283,7 +288,8 @@ def dict_sort_key(keyval: Tuple[str, Any]) -> bool:
             if "*" in key:
                 dims = callbacks.dims(key, value)
                 dim_data = fill_wildcard_data_indices(config_dict, key, value, dims)
-                for k, v in dim_data.items():
+
+                for k, v in dim_data.copy().items():
                     resolve_special_keys(
                         dim_data,
                         k,