Is this behavior expected from binding?

user=> (def a nil)
#'user/a
user=> (def b nil)
#'user/b
user=> (binding [a 1 b (+ a 1)] a)
java.lang.NullPointerException (NO_SOURCE_FILE:0)
user=> (binding [a 1 b (+ a 1)] b)
java.lang.NullPointerException (NO_SOURCE_FILE:0)
user=> (let [a 1 b (+ a 1)] a)
1
user=> (let [a 1 b (+ a 1)] b)
2

Thanks,
Brandon
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