diff --git a/lib/utils/utils.js b/lib/utils/utils.js
index 34ffe50ef..fb8875c50 100644
--- a/lib/utils/utils.js
+++ b/lib/utils/utils.js
@@ -326,6 +326,7 @@ function soliditySha3(arg) {
 }
 
 function normalizeInput(input) {
+  if(typeof input === 'string') return input;
   let args = Object.values(input);
   if (args.length === 0) {
     return "";