diff --git a/src/Helpers/TransactionQuery.php b/src/Helpers/TransactionQuery.php
index 2db186f..65322e6 100644
--- a/src/Helpers/TransactionQuery.php
+++ b/src/Helpers/TransactionQuery.php
@@ -143,7 +143,7 @@ public function conversationId(string $originatorConversationId){
     public function okay()
     {
         parent::okay();
-        if(empty($this->transId)) {
+        if(empty($this->conversationId)) {
             $this->assertExists("transId", "Transaction ID");
         }