Xcode 6 strange (null) object display in debugger

I'm seeing a strange behavior with Xcode 6 debugger. I have created a singleton shared instance using the following code:

+ (instancetype)shared 
{
    static DataBaseManager *sharedInstance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
    sharedInstance = [[DataBaseManager alloc] init];
    });

   return sharedInstance;
}

Right after the object is initialized by calling the method like this:

DataBaseManager *manager = [DataBaseManager shared];
NSLog(@"");

I have placed a breakpoint on the "NSLog", and i'm seeing the following debugger status:

I have made sure I'm launching on debug mode, and that the build settings are fine, following the question here: Xcode debugger doesn't print objects and shows nil, when they aren't

Any ideas on why this is happening? This is the first time i have ever seen this kind of strange behavior. Any help would be much appreciated.

**UPDATE**

A bug was reported to apple bug report system.
The bug status is: Duplicate of 17164538 (Closed) 

so it is probably a known bug in Xcode.

---

You shouldn't be in Release mode while you are debugging your code.

If you want to see variable values you have to be in Debug mode . The steps are

Click on your project name on the top left corner near start/stop buttons

Go in Edit scheme

Go in Run settings

Go in Info tab and then Build Configuration

Set it to Debug

If it was on "Release" that's the matter you saw all nil. If still not working then try following in the project Build Settings

Set Strip debug symbols during copy to NO

Optimization Level to None -O0

---

尝试在您的构建设置中将部署后处理设置为NO并检查。

---

确保您在生成设置中将调试模式的Link-Time Optimization设置为否。

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