I have this snippet of a Java code:
```
class A {                                                                    
                                                                                 
    String mayReturnNull(int i) {                                                
        if (i > 0) {                                                             
            return "Hello, Infer!";                                              
        }                                                                        
        return null;                                                             
    }                                                                            
                                                                                 
    int mayCauseNPE() {                                                          
        String s = mayReturnNull(0);                                             
        return s.length();                                                       
    }                                                                            
                                                                                 
}  
```

Can you tell me if there is something wrong with it?