diff --git a/static/admin/lib/errors-utils.js b/static/admin/lib/errors-utils.js
index e32c528..106cd16 100644
--- a/static/admin/lib/errors-utils.js
+++ b/static/admin/lib/errors-utils.js
@@ -4,7 +4,8 @@ const lib_errors = {
   extractJqxhrErrorMsg: function(jqxhr) {
     let hasErrorMsg = ('responseJSON' in jqxhr) &&
       (jqxhr['responseJSON'] != null) &&
-      ('error' in jqxhr['responseJSON'])
+      ('error' in jqxhr['responseJSON']) &&
+      (typeof jqxhr['responseJSON']['error'] == 'string')
 
     return hasErrorMsg ? jqxhr['responseJSON']['error'] : jqxhr.statusText
   },