Ionic3 image picker app crash issue

ionic 3 image picker ask permission when i deny permission go to picker page after close page app crash in ios only but it work on android device

any one please help to find solution

cli packages: (/usr/local/lib/node_modules)

@ionic/cli-utils : 1.19.2
ionic (Ionic CLI) : 3.20.0

global packages:

cordova (Cordova CLI) : 8.0.0

local packages:

@ionic/app-scripts : 3.1.8
Cordova Platforms : ios 4.5.5
Ionic Framework : ionic-angular 3.9.5

System:

Node : v8.11.2
npm : 5.6.0
OS : macOS
Xcode : Xcode 10.2.1 Build version 10E1001

Environment Variables:

ANDROID_HOME : not set

Misc:

backend : pro