diff --git a/addons/web/static/src/js/formats.js b/addons/web/static/src/js/formats.js
index 854c5f76218..998855c5bd4 100644
--- a/addons/web/static/src/js/formats.js
+++ b/addons/web/static/src/js/formats.js
@@ -142,6 +142,7 @@ instance.web.format_value = function (value, descriptor, value_if_empty) {
             }
             console.warn('Field', descriptor, 'had an empty string as value, treating as false...');
         case false:
+        case undefined:
         case Infinity:
         case -Infinity:
             return value_if_empty === undefined ?  '' : value_if_empty;