init instance variable multiple times

can this code cause any potential trouble?

@property (nonatomic, retain) NSDictionary *instanceDictionary;

for(int i = 0; i < 50; i++){
   self.instanceDictionary = [NSDictionary alloc] init];
}

or without self

for(int i = 0; i < 50; i++){
   instanceDictionary = [NSDictionary alloc] init];
}

I came across situations where a instance variable gets "overridden" like this and was wondering if it could cause any memory problems.

via Chebli Mohamed