I've not been keeping track of browser versions... but from looking at MDN's docs, trimStart was added in Firefox v61. Which would pretty much be the same issue.
Hopefully manually patching the "/Umbraco/lib/umbraco/Extensions.js" file (or upgrading Umbraco) will resolve this for you.
404 error in backend
Hi there,
I keep getting this error in the backend. Weard thing is that I have changed nothing on this site for about 3-4 month. The error suddenly appeared.
Can anyone help?
Thanks
You've hit the infamous
trimStart
bug. See this blog post for more details: https://umbraco.com/blog/chrome-66-causing-errors-on-some-umbraco-sites/Hi Lee, thanks for your reply. But is this issue not only concerning the use in Chrome? I am using Firefox and also tried in Edge with same result.
Thanks
Update:
Sorry, you were right. In Edge everything works just fine. But Firefox brings the error as described above.
Hi Edgar,
I've not been keeping track of browser versions... but from looking at MDN's docs,
trimStart
was added in Firefox v61. Which would pretty much be the same issue.Hopefully manually patching the "/Umbraco/lib/umbraco/Extensions.js" file (or upgrading Umbraco) will resolve this for you.
Cheers,
- Lee
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