diff --git a/src/bigint.js b/src/bigint.js
index cbb2c0f..0d6f6e9 100644
--- a/src/bigint.js
+++ b/src/bigint.js
@@ -473,6 +473,10 @@ wBigInt.leInt2Buff = function(n, len) {
     return buff;
 };
 
+wBigInt.prototype.leInt2Buff = function (len) {
+    return wBigInt.leInt2Buff(this,len);
+};
+
 
 module.exports = wBigInt;
 
diff --git a/src/calculateWitness.js b/src/calculateWitness.js
index 6fa8f64..87e139b 100644
--- a/src/calculateWitness.js
+++ b/src/calculateWitness.js
@@ -45,6 +45,8 @@ function calculateWitness(circuit, inputSignals, log) {
     for (let s in inputSignals) {
         ctx.currentComponent = "main";
         iterateSelector(inputSignals[s], [], function(selector, value) {
+            console.log("xxxx");
+            if (typeof(value) == "undefined") throw new Error("Signal not defined:" + s);
             ctx.setSignal(s, selector, bigInt(value));
         });
     }