diff --git a/matlab/src/classes/@MatMust/MatMust.m b/matlab/src/classes/@MatMust/MatMust.m
index 3f5fae783dc589b874848c8aef92d6b7eeebfc14..2bc392a8aff59ca547aa9dc8c105a02c40e95bb8 100644
--- a/matlab/src/classes/@MatMust/MatMust.m
+++ b/matlab/src/classes/@MatMust/MatMust.m
@@ -183,7 +183,7 @@ classdef MatMust < handle
             %refine date string to adapt MATLAB date format
             for i=1:numel(data{1})
                 if isempty(data{1}(i).data)
-                    fprintf('+++ WARNING\n%s for %s\n', 'No Data existing in time span', data.name)
+                    fprintf('+++ WARNING\n%s for %s\n', 'No Data existing in time span', data{1}.name)
                     continue
                 end
                 data_par = data{1}(i).data;