Summary

Fixes #1155

Adds a nil check before calling setNeedsStatusBarAppearanceUpdate on the rootViewController in the dismiss animation completion block.

Problem

When SVProgressHUD is dismissed, the animation completion block retrieves the rootViewController and calls setNeedsStatusBarAppearanceUpdate on it. If the rootViewController has been deallocated (e.g., during view controller transitions), this causes a crash.

Solution

Simple nil check before the method call:

UIViewController *rootController = [SVProgressHUD mainWindow].rootViewController;
if (rootController) {
    [rootController setNeedsStatusBarAppearanceUpdate];
}

Testing

• Verified the fix compiles correctly
• The status bar appearance update is a visual nicety, not critical functionality, so skipping it when rootViewController is nil has no adverse effects