diff --git a/src/core/helpers/api.js b/src/core/helpers/api.js
index 9b7a2a8b2afbdcc8d64f28e1ac8e242198170a10..3ca954d8d507f24694270071af1f04e3e3c880d0 100644
--- a/src/core/helpers/api.js
+++ b/src/core/helpers/api.js
@@ -163,8 +163,13 @@ function createApiCallback (apiName, params = {}, extras = {}) {
       res.errMsg = apiName + ':ok'
     } else if (res.errMsg.indexOf(':cancel') !== -1) {
       res.errMsg = apiName + ':cancel'
-    } else if (res.errMsg.indexOf(':fail') !== -1) {
-      res.errMsg = apiName + ':fail' + res.errMsg.substr(res.errMsg.indexOf(' '))
+    } else if (res.errMsg.indexOf(':fail') !== -1) {
+      let errDetail = ''
+      let spaceIndex = res.errMsg.indexOf(' ')
+      if (spaceIndex > -1) {
+        errDetail = res.errMsg.substr(spaceIndex)
+      }
+      res.errMsg = apiName + ':fail' + errDetail
     }
 
     const errMsg = res.errMsg