2. click download btn
3. have error in
vendor/kartik-v/yii2-export/src/ExportMenu.php:1394
## Expected behavior and actual behavior
When I follow those steps, I see...
Error
I was expecting...
pick `class` from closure result
## Environment
#### Browsers
- [ ] Google Chrome
- [ ] Mozilla Firefox
- [ ] Internet Explorer
- [ ] Safari
#### Operating System
- [ ] Windows
- [ ] Mac OS X
- [ ] Linux
- [ ] Mobile
#### Libraries
- jQuery version:
- yii2-export version:
## Isolating the problem
- [ ] This bug happens [on the demos page](https://demos.krajee.com/export-demo)
- [x] The bug happens consistently across all tested browsers
- [x] This bug happens when using yii2-export without other plugins.
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Prerequisites
master
branch of yii2-export.Steps to reproduce the issue