diff --git a/dashboard/src/components/UserDialog.vue b/dashboard/src/components/UserDialog.vue
index 0f0d429e2..2eecca055 100644
--- a/dashboard/src/components/UserDialog.vue
+++ b/dashboard/src/components/UserDialog.vue
@@ -72,7 +72,7 @@ async function onSubmit() {
   let userId = user.value ? user.value.id : null;
 
   // can only be set not updated
-  if (!user.value || !user.value.username) data.username = username.value || null;
+  if ((!user.value || !user.value.username) && username.value) data.username = username.value;
 
   const isExternal = user.value && user.value.source;