why hook systemFontOfSize cause app crash?

[Dast1Woop]

when I put the following code in category or homeViewController, the app will crash:
[UIFont st_hookClassMethod:@selector(systemFontOfSize:) option:(STOptionInstead) usingIdentifier:(@"myHook_fontWithSize") withBlock:^UIFont * (id params, CGFloat oldPara){
UIFont *oldRet;
[params invokeAndGetOriginalRetValue:&oldRet];
CGFloat newSize = oldRet.pointSize * 2;
return [UIFont fontWithName:oldRet.familyName size:newSize];
}];

the crash info is:
2023-06-28 18:00:33.468715+0800 ChangeFontSizeTest[1784:376274] [Assert] UINavigationBar decoded as unlocked for UINavigationController, or navigationBar delegate set up incorrectly. Inconsistent configuration may cause problems. navigationController=<UINavigationController: 0x15c01c200>, navigationBar=<UINavigationBar: 0x15bd09d50; frame = (0 59; 0 50); opaque = NO; autoresize = W; layer = <CALayer: 0x2833c74c0>> delegate=0x15c01c200

pls help!

[Dast1Woop]

when I put the the above code in the example project of this repo, it will crash too!!! please test and help!