swift SDK crashed when call next page

[hanyegudeng]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [✔️] bug report -> please search issues before submitting
- [×] feature request
- [×] documentation issue or request
- [×] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

swift listMessages, call next will crash (just next page is empty, It's very easy to reproduce).

var itar = list.syncIterator
while let msg = itar.next() {}

Any log messages given by the failure

Expected/desired behavior

OS and Version?

iOS

Versions

1.2.0

Mention any other details that might be useful

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