Edit page does not finish loading

Hi,
I’m having problems with and Edit Page from a View of my project. As I see it loads all html and php code, I see menu section, and then the edit page loading circle appears and stays there.
In firefox I get this error:
Source map error: Error: JSON.parse: unterminated string at line 1 column 155649 of the JSON data
In Chrome I get this error: DevTools failed to parse SourceMap: …

I’ve also commented all the custom code in all events of that view, synchronize all db, delete template cache, delete browsers’ cache, and edit page loading circle stays there.

Do you know what could be happening?

Source maps are for debugging JavaScript only, source map errors do not affect browser running the JavaScript. If the spinner does not stop, there must be some other JavaScript errors which actually prevent the JavaScript from completing successfully. You may run the page and check JavaScript errors at Console panel again.