Issue when using voice seach with async task ....

[ranaprathap2]

on voice search i load the search term to another fragment and execute an async task that contains the following lines of code...... Upon entering doInBackground the app crashes with voice seach. But the normal search using text works anyways !

override fun doInBackground(vararg params: ArrayList<String>?): List<Contractor> {
if(params[0]==null){ // Program stop here and crashes
                Log.i("ViewContractsFragment","ArrayList is empty")
           }
}

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.servicetap, PID: 21895
java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.Iterator java.util.ArrayList.iterator()' on a null object reference
at com.michaelgarnerdev.materialsearchview.MaterialSearchView.onError(MaterialSearchView.java:1753)
at android.speech.SpeechRecognizer$InternalListener$1.handleMessage(SpeechRecognizer.java:451)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6863)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)