Crash ButtonBarPagerTabStripViewController because duplicate index reload

[marko012]

Hello,

I found a lot of crashes inside my app locating to XLPagerTabStrip.

• Environment: XLPagerTabStrip 9.0, Xcode 10.2.1 and iOS 12.2.
• Crash Location: ButtonBarPagerTabStripViewController.swift - Line 263 ButtonBarPagerTabStripViewController.cellForItems(at:reloadIfNotVisible:) + 263
• Crash Description: Fatal Exception: NSInvalidArgumentException -[__NSArrayM insertObject:atIndex:]: object cannot be nil ButtonBarPagerTabStripViewController.cellForItems(at:reloadIfNotVisible:)
• Crash Reproduction: I do not know how it happens, but crash happens if you call: buttonBarView.reloadItems(at: [IndexPath(row: 0, section: 0), IndexPath(row: 0, section: 0)])

Can you please do some check if comes to duplicated reloadItems to solve this issue.

Thank you Marko