unfortunately process.com.android.systemui has stopped

I own an infinix x506. I recently observed that whenever a call comes in, a dialogue box pops up saying unfortunately process.com.android.systemui has stopped. When this happens, I have go click OK after which the screen goes blank for a while, before I am then able to access the call. More...

unfortunately process.com.android.systemui has stopped

unfortunately process.com.android.systemui has stopped