nativescript-vue application crashes on splash screen (only in iOS) - ios

Since one week i try to figure out what am i doing wrong.
I created a nativescript-vue application which works fine on android.
Now i have to run the same App on an iOS device.
In my first try i got any errors i figured out and successfully got my app build running on my simulator on my mac.
Now i have another problem. The Console logs said, my build was successfully and it start on the simulator as expected but it crashes at the splash screen (with no errors).
I build another fresh app according to the official constructions.
There was one bug i fixed and the app runs as expected.
I decided to transfer the files from my main application one by one until the problem occurs.
The strange thing is, the app was running and did not crash in splash screen until i rerun the command "tns run ios --bundle" a few minutes later.
Now the app crashes again without any errors.
I hope anyone could help me.
System:
macOS Catalina - version: 10.15.1
node: v13.2.0
xcode: 11.2.1
nativescript: 6.2.2

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