Merge pull request #2841 from garrett-gottlieb/patch-2

fixes #2840

lib/dialects/postgres/query.js

@@ -275,7 +275,7 @@ module.exports = (function() {
               field + ' must be unique', 'unique violation', field, value));
               field + ' must be unique', 'unique violation', field, value));
           });
           });
 
 
-          if (this.callee.__options && this.callee.__options.uniqueKeys) {
+          if (this.callee && this.callee.__options && this.callee.__options.uniqueKeys) {
             Utils._.forOwn(this.callee.__options.uniqueKeys, function(constraint) {
             Utils._.forOwn(this.callee.__options.uniqueKeys, function(constraint) {
               if (Utils._.isEqual(constraint.fields, Object.keys(fields)) && !!constraint.msg) {
               if (Utils._.isEqual(constraint.fields, Object.keys(fields)) && !!constraint.msg) {
                 message = constraint.msg;
                 message = constraint.msg;