AdmobExpressRecyclerAdapterWrapper crashes application on fast scroll

[pranavchaudhary]

Admobadapter version or commit: 1.4.6

Android compileSdkVersion: 267

Issue description briefly: I have implemented AdmobExpressRecyclerAdapterWrapper and on opening application the recycler view item flicker meantime if i scroll application to the end, it crash

**Steps to reproduce: Implement AdmobExpressRecyclerAdapterWrapper, install and scroll fast till end **

admobExpressRecyclerAdapterWrapper = AdmobExpressRecyclerAdapterWrapper.builder(this)
.setLimitOfAds(20)
.setFirstAdIndex(2)
.setNoOfDataBetweenAds(4)
.setAdapter(adapter)
.setSingleAdUnitId(getString(R.string.banner_ad_unit_id))
.build();