1. Analyze Crash Log → 2. Locate Bug → 3. Fix Code → 4. Clean Build Artifacts → 5. Generate Patch → 6. Commit & PR

EXC_BAD_ACCESS: KERN_INVALID_ADDRESS at 0x3c61c1a3b0d0
 objc_msgSend in unknown file
 -[SDWebImageManager cacheKeyForURL:context:]  ← Crashing function
 -[SDWebImageManager loadImageWithURL:options:context:progress:completed:]

# iOS (Swift/Objective-C)
ls node_modules/<package>/ios/

# Android (Kotlin/Java)
ls node_modules/<package>/android/src/main/java/

// Before (crashes when uri is nil)
imageManager.loadImage(with: source.uri, ...)

// After (safe)
guard let sourceUri = source.uri, !sourceUri.absoluteString.isEmpty else {
  onError(["error": "Image source URI is nil or empty"])
  return
}
imageManager.loadImage(with: sourceUri, ...)

// Before
val uri = source.uri
loadImage(uri)

// After
val uri = source.uri ?: return
if (uri.toString().isEmpty()) return
loadImage(uri)

# Remove Android build artifacts to avoid polluting the patch
rm -rf node_modules/<package>/android/build

# For expo-image specifically:
rm -rf node_modules/expo-image/android/build

# Generate patch file
npx patch-package <package-name>

# Example:
npx patch-package expo-image

# Check patch doesn't include unwanted files
grep -c "android/build" patches/<package-name>*.patch
# Should return 0

# View actual changes
head -100 patches/<package-name>*.patch

# Stage patch file
git add patches/<package-name>*.patch

# Commit with descriptive message
git commit -m "fix(ios): prevent EXC_BAD_ACCESS crash in <package> when <condition>

Add guard checks in <package> native layer to prevent crash when <scenario>.

Fixes Sentry issue #XXXXX"

# Create PR
gh pr create --title "fix(ios): <description>" --base x

ls patches/
cat patches/expo-image+3.0.10.patch

# Clean all build artifacts
rm -rf node_modules/<package>/android/build
rm -rf node_modules/<package>/ios/build
rm -rf node_modules/<package>/.gradle

# Regenerate
npx patch-package <package>

# Check package version matches
cat node_modules/<package>/package.json | grep version

# Rename patch if version changed
mv patches/<package>+old.patch patches/<package>+new.patch

guard let value = optionalValue else {
  return  // Must exit scope
}
// value is now non-optional

val value = nullableValue ?: return
// value is now non-null