Strange event in html5

When testing the game in html5 it happens that after a few seconds or minutes the browser screen turns black and it remains like this, any idea of what it may be, it happens in chrome and edge. create a blank level with the character alone and it keeps happening.

In the log See this ,It is important?
Level:     INFO
When:      2021-08-10 01:41:50:310
From:      stencyl.sw.util.StreamGobbler

[haxelib.exe] C:/Program Files/Stencyl/plaf/haxe/lib/polygonal-ds/2,0,0/src/polygonal/ds/tools/Assert.hx:62: characters 15-23 : Warning : This typedef is deprecated in favor of js.lib.Error