Merge pull request #4112 from sequelize/sdepold-patch-1

Check for `and` or `or`

lib/dialects/abstract/query-generator.js

@@ -2091,7 +2091,7 @@ var QueryGenerator = {
     }
 
     if (smth && smth._isSequelizeMethod === true) { // Checking a property is cheaper than a lot of instanceof calls
-      if (smth instanceof Utils.and || smth instanceof Utils.and) {
+      if (smth instanceof Utils.and || smth instanceof Utils.or) {
         return self.whereItemsQuery(smth, {
           model: factory,
           prefix: prepend && tableName