diff --git a/lib/models/index.js b/lib/models/index.js
index a378ee677..95f900b6d 100644
--- a/lib/models/index.js
+++ b/lib/models/index.js
@@ -23,6 +23,7 @@ if (config.dburl) {
 // [Postgres] Handling NULL bytes
 // https://github.com/sequelize/sequelize/issues/6485
 function stripNullByte (value) {
+  value = '' + value
   return value ? value.replace(/\u0000/g, '') : value
 }
 sequelize.stripNullByte = stripNullByte