Session Problem in CI4

I know its very funny and everybody of you will be laughing. But I found the following Solution. Don't know how and why its behaving like this. I did change nothing. Just added the following line in the BaseController init controller function and its start working. Then I delete the line and again its not work. Then again added this line and again working. I don't know the reason. Just think if any of you face my same problem, may be get your solution!!!

Code:

$this->session->someKey = "someValue";

Here you get the session key on your problem you only set only key but you didn't call the key so!!! ???

Codeigniter First, Codeigniter Then You!!

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