diff --git a/api.php b/api.php
index 8b30184..6562e92 100755
--- a/api.php
+++ b/api.php
@@ -804,10 +804,10 @@ if ($q == "getAddress") {
         api_err("An asset or an account are necessary");
     }
 
-    if(isset($asset)&&isset($account)){
+    if(!empty($asset)&&!empty($account)){
         api_err("Choose account or asset parameter");
     }
-    
+
     $whr="WHERE assets_balance.";
     $bind=[];
     if(!empty($asset)){