crash occurs when text is an empty string

[mengkeer]

For example,for the following cases, a crash will occur

        NSString *text = @"";
        NSString *key = @"key";
        
        for (int i = 0; i < 10000; i++) {
            NSString *encrypt_data = [XXTEA encryptStringToBase64String:text stringKey:key];
            NSString *decrypt_data = [XXTEA decryptBase64StringToString:encrypt_data stringKey:key];
            NSLog(@"%@", encrypt_data);
            NSLog(@"%d",i);
            if ([text isEqual:decrypt_data]) {
                NSLog(@"success!");
            }
            else {
                NSLog(@"fail!");
            }
        }