fix 'k' variable as a Number in splice method

services/customization.service.ts

@@ -14,7 +14,7 @@ export class CustomizationService {
         const isArray = obj instanceof Array;
         for (let k in obj) {
             if (obj[k] === null || obj[k] === '') {
-                isArray ? obj.splice(k, 1) : delete obj[k];
+                isArray ? obj.splice(Number.parseInt(k), 1) : delete obj[k];
             } else if (typeof obj[k] === 'object') {
                 CustomizationService.removeNulls(obj[k]);
             }