fix: rebiew comments

Signed-off-by: Samarpan Bhattacharya <this.is.samy@gmail.com>

Author: samarpanB

lib/sql.js

@@ -562,7 +562,7 @@ SQLConnector.prototype.buildInsertAll = function(model, data, options) {
     return null;
   }
   const fieldsArray = this.buildFieldsFromArray(model, data);
-  if (fieldsArray.length === 0) {
+  if (Array.isArray(fieldsArray) && fieldsArray.length === 0) {
     debug('no fields found for insert query');
     // return immediately if no fields found
     return null;
@@ -1269,7 +1269,7 @@ SQLConnector.prototype.buildFields = function(model, data, excludeIds) {
  */
 SQLConnector.prototype.buildFieldsFromArray = function(model, data, excludeIds) {
   const fields = [];
-  if (data.length > 0) {
+  if (Array.isArray(data) && data.length > 0) {
     const keys = Object.keys(data[0]);
     for (let i = 0; i < data.length; i++) {
       fields.push(this._buildFieldsForKeys(model, data[i], keys, excludeIds));