Chrome DevTools won't let me set breakpoints on certain lines

If you are using js minification and sourcemaps, ensure that they are up to date with your source code.

I have same problem in chrome dev tool source panel snippets when I write some codes to test my idea.

Only way for me worked is close dev tool panel and refresh page then reopen

This problem happened after I modified codes in debug mode

This was frustrating for me today but I found the problem. I was trying to place a breakpoint inside an orphan function (nothing was calling it). As soon as I fixed it, all was well. Smart - but wish there was even a tiny hint that this was the case.