diff --git a/meshchatx/src/frontend/components/messages/SendMessageButton.vue b/meshchatx/src/frontend/components/messages/SendMessageButton.vue
index 378a964..462b183 100644
--- a/meshchatx/src/frontend/components/messages/SendMessageButton.vue
+++ b/meshchatx/src/frontend/components/messages/SendMessageButton.vue
@@ -121,8 +121,8 @@ export default {
     name: "SendMessageButton",
     props: {
         deliveryMethod: {
-            type: String,
             required: true,
+            validator: (value) => value === null || typeof value === "string",
         },
         canSendMessage: Boolean,
         isSendingMessage: Boolean,