Crash when Exit and Reopen while Primitive Operation Running

[rahulk64]

How to Reproduce Issue: Run through Options Activity, click run, and let the Primitive Library start running. Then close app, (in my case through clicking open a new app from notifications), then return to Primitive, and either Cancel (in my case) or save, and it can't return to Main Activity

Error Log:
FATAL EXCEPTION: main
Process: com.solunaire.vectrize, PID: 4761
java.lang.RuntimeException: Unable to resume activity {com.solunaire.vectrize/com.solunaire.vectrize.MainActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=5, result=0, data=null} to activity {com.solunaire.vectrize/com.solunaire.vectrize.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView.setAdapter(android.support.v7.widget.RecyclerView$Adapter)' on a null object reference
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3645)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3685)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2898)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=5, result=0, data=null} to activity {com.solunaire.vectrize/com.solunaire.vectrize.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView.setAdapter(android.support.v7.widget.RecyclerView$Adapter)' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:4324)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3617)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3685) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2898) 
at android.app.ActivityThread.-wrap11(Unknown Source:0) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593) 
at android.os.Handler.dispatchMessage(Handler.java:105) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6541) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView.setAdapter(android.support.v7.widget.RecyclerView$Adapter)' on a null object reference
at com.solunaire.vectrize.MainActivity.onActivityResult(MainActivity.java:208)
at android.app.Activity.dispatchActivityResult(Activity.java:7235)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4320)