Error CE-34878-0 could erase your game data, render games unplayable, or destroy your PS4 entirely, and we know almost nothing about it.
I know that last part of the above sentence isn’t what you’d like to hear in an article like this, but that’s the unfortunate truth: as of right now, we don’t know what causes this error, or any definitive fixes. But here’s everything we know right now–called Error CE-34878-0 based on the message that comes up when games crash, this bug isn’t isolated to any one game or application that we know of–it’s indicative to the PS4 console itself.
As for what the bug does, it ranges from player to player: some simply lose all their game data, and they can be counted among the lucky ones: less lucky ones have entire games corrupted to the point where they become unplayable. And the most unlucky among those with the problem report that nothing on their system will work anymore, and it becomes effectively a big plastic brick.
While not knowing what causes the crash is bad, Sony has addressed the issue in the 34-page thread where the problem was reported that hopes to fix it. They suggest users “close the application and then install the latest system software and game patch. If the error occurs again, initialise the PS4 system after back-up of the save data and please also submit any crash reports after re-booting your console when the error occurs.”
Still, there’s no word on how reliable that treatment is. Sony has been reached for further comment, and I will update this article when it gets back to us.