Attempt to invoke interface method 'int java.lang.CharSequence.length()' on a null object reference

[lezinx]

Description

App crashes on startup only in debug mode. Release build is fine.
Device: Samsung A11, android 10.

java.lang.NullPointerException: Attempt to invoke interface method 'int java.lang.CharSequence.length()' on a null object reference
    at java.util.regex.Matcher.reset(Matcher.java:280)
    at java.util.regex.Matcher.<init>(Matcher.java:186)
    at java.util.regex.Pattern.matcher(Pattern.java:1034)
    at com.facebook.react.devsupport.BundleDownloader$1.onResponse(BundleDownloader.java:144)
    at okhttp3.RealCall$AsyncCall.execute(RealCall.java:203)
    at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    at java.lang.Thread.run(Thread.java:919)

React Native version:

System:
OS: macOS 10.15.7
CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
Memory: 296.55 MB / 16.00 GB
Shell: 5.7.1 - /bin/zsh
Binaries:
Node: 15.12.0 - ~/.nvm/versions/node/v15.12.0/bin/node
Yarn: 1.22.10 - /usr/local/bin/yarn
npm: 7.6.3 - ~/.nvm/versions/node/v15.12.0/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
Managers:
CocoaPods: 1.10.1 - /Users/z.ledai/.rbenv/shims/pod
SDKs:
iOS SDK:
Platforms: iOS 14.4, DriverKit 20.2, macOS 11.1, tvOS 14.3, watchOS 7.2
Android SDK:
API Levels: 28, 29, 30
Build Tools: 28.0.3, 29.0.2, 29.0.3, 30.0.3
System Images: android-30 | Google APIs Intel x86 Atom, android-30 | Google Play Intel x86 Atom
Android NDK: Not Found
IDEs:
Android Studio: 4.1 AI-201.8743.12.41.7199119
Xcode: 12.4/12D4e - /usr/bin/xcodebuild
Languages:
Java: 1.8.0_222 - /usr/bin/javac
npmPackages:
@react-native-community/cli: Not Found
react: 17.0.1 => 17.0.1
react-native: 0.64.1 => 0.64.1
react-native-macos: Not Found
npmGlobalPackages:
react-native: Not Found

Steps To Reproduce

Provide a detailed list of steps that reproduce the issue.

1. npx react-native init AwesomeProject
2. npx react-native run-android

[luskin]

@lezinx what was the reason for this? We are experiencing the same

[lezinx]

@lezinx what was the reason for this? We are experiencing the same

Check if port is used by other program and if it used kill it. Run lsof -i :8081 in terminal to check