diff --git a/src/caosadvancedtools/table_importer.py b/src/caosadvancedtools/table_importer.py
index 8665eb30cf7162478472a9d31401732ed6edd87b..10a4b87c11f74d91a625c88d6c521af600816a96 100755
--- a/src/caosadvancedtools/table_importer.py
+++ b/src/caosadvancedtools/table_importer.py
@@ -88,7 +88,10 @@ def date_converter(val, fmt="%Y-%m-%d"):
     converts it using format string
     """
 
-    return datetime_converter(val, fmt=fmt).date()
+    if val is None:
+        return None
+    else:
+        return datetime_converter(val, fmt=fmt).date()
 
 
 def incomplete_date_converter(val, fmts={"%Y-%m-%d": "%Y-%m-%d",