diff --git a/services/web/apps/inv/inv/plugins/data.py b/services/web/apps/inv/inv/plugins/data.py
index b760356f37ebc9eb4a21794bc2055d3b9f7d3f30..425679dc9b2da81a43ba5460f84aa825f0363d43 100644
--- a/services/web/apps/inv/inv/plugins/data.py
+++ b/services/web/apps/inv/inv/plugins/data.py
@@ -13,7 +13,7 @@ from collections import defaultdict
 from noc.inv.models.object import Object
 from noc.inv.models.objectmodel import ObjectModel
 from noc.inv.models.modelinterface import ModelInterface
-from noc.sa.interfaces.base import StringParameter, UnicodeParameter
+from noc.sa.interfaces.base import StringParameter
 from .base import InvPlugin
 
 
@@ -43,7 +43,7 @@ class DataPlugin(InvPlugin):
             validate={
                 "interface": StringParameter(),
                 "key": StringParameter(),
-                "value": UnicodeParameter(),
+                "value": StringParameter(default="", required=False),
             },
         )