Ionic app crashes on iOS 12.2 because of '_alwaysRunsAtForegroundPriority'

Question

On iOS 12.2 my app is terminated just after startup, with this message in xcode:

Terminating app due to uncaught exception \'NSUnknownKeyException\', rea

Answer 1

To find which of the plugins you use is causing the error run:

cd %HOME%/src/myProject    
grep -r "_alwaysRunsAtForegroundPriority" node_modules

Once you find it, look for an upgrade that solves the problem or replace it with an alternate plugin.

In our case, the plugin was WKWebView. A quick search on google found they had an error and fixed it. We upgraded the plugin and it worked smoothly.