diff --git a/utils.js b/utils.js
index 42b230f..15d7932 100644
--- a/utils.js
+++ b/utils.js
@@ -322,6 +322,14 @@ function removeLeadZero(data) {
   return 0;
 }
 
+function safeDumpErrStack(err) {
+  if (err && err.stack) {
+    console.log(err.stack);
+  } else {
+    console.log('safeDumpErrStack: no stack');
+  }
+}
+
 exports.rspErr = rspErr;
 exports.rspOk = rspOk;
 exports.rspData = rspData;
@@ -362,3 +370,4 @@ exports.mapToArray = mapToArray;
 exports.mapToObject = mapToObject;
 exports.arrayToStrings = arrayToStrings;
 exports.removeLeadZero = removeLeadZero;
+exports.safeDumpErrStack = safeDumpErrStack;