I'm trying to use `NSAssert` in my code but it doesn't do a thing.

In this piece of code, the assertion should fail but doesn't:

```
    MSLog(@"cross.obj = %@",[cross obj]);
    NSAssert([cross obj]!=nil,@"[cross obj] == nil");

```

The output of this is:

> 
> cross.obj = (null)
> 
> 
> 

**What could be the problem?**