workbench.aspx break when clicking "Preview"

Question

On every web part I develop, running in&nbsp;/_layouts/15/workbench.aspx of all tenants I have access to, clicking the preview to debug, causes an error:"Uncaught Error Error: The value for "domElement" must not be null
at e.isNotNullOrUndefined (res-1.cdn.office.net/files/sp-client/sp-webpart-workbench-assembly_en-us_a25d16d016d17db18ed91fbf7b537caf.js:20:183787"&nbsp;I see it was reported in&nbsp;https://stackoverflow.com/&nbsp;but no explanation or solution.Please fix our&nbsp;workbench! Lots of SPFx developers are stock now.Thank you&nbsp;

abdul-alhariri · Answer

I'm having same problem. it seems React version issue. If started a web part without using react, it works fine!

ofergalinisrael · Answer

abdul-alharirialhariri So&nbsp;no longer React support for SPFx?

craig-pulliam · Answer

I’m seeing this issue as well.

ganeshsanap · Answer

ofergalinIsrael&nbsp;Craig-Pulliam&nbsp;abdul-alhariri&nbsp;
&nbsp;
Try this:

Create a site page in any of your SharePoint site for testing SPFx web part
After running gulp serve command, instead of using workbench URL, use URL like:&nbsp;https://contoso.sharepoint.com/sites/MySite/SitePages/TestingPageName.aspx?loadSPFX=true&amp;debugManifestsFile=https://localhost:4321/temp/manifests.js

Similar thread:&nbsp;SPFx workbench crashes when I try to enter "Preview" mode&nbsp;

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ofergalinisrael · Answer

ganeshsanap&nbsp;I know I can do this but there are limitations.Most My webparts are full page and deployed as app. So, development is best in the workbench.I found out I can work with it without hitting preview.&nbsp;I just don't understand why MS can't figure a fi,x for a month now, to a product they brag about as a tool for SPFx.&nbsp;&nbsp;

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workbench.aspx break when clicking "Preview"