This is a serious problem for me. Input lists are considered as the first input by the 
block. Is there any solution for that?
You're misunderstanding how "input list" works. It's JOIN, not =, that has a variadic input.
But in any case, when you use "input list," you have to give it a list!! The value of the + block (not in a ring) is 0, because it takes the empty inputs as zeros, 0 isn't a list.
There is one unneeded block among us...
No. I was comparing these two blocks and the block reported true, when the correct answer is false.
Exactly. It has to report false.
Nevermind, I've solved the problem by adding a patch. Thank you for your consideration 