On iOS 12.2 my app is terminated just after startup, with this message in xcode:
Terminating app due to uncaught exception \'NSUnknownKeyException\', rea
I had a similar issue with our ionic 3 app crashing on startup with the iOS beta 12.2. I also have the latest release of cordova-plugin-background-mode.
I fixed my issue by upgrading to version 2.3.2 of the cordova-plugin-ionic-webview plug-in.
Try that. If it doesn’t fix it, please post your plugins and versions so I can compare.
Update Feb 5th, 2019
I screwed up answering earlier. I'm currently using cordova-plugin-better-background-mode@0.7.5 which is a fork of cordova-plugin-background-mode@0.7.2
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Try switching to that one. If that doesn't work I'll post the rest of the differences that we might have.