Error when only 1 data in array

[rizkikurniaa]

hi, i got this error when data in array only 1 data but when its more than just 1 its running well. How to handle this? FATAL EXCEPTION: main Process: com.iss, PID: 2608 java.lang.UnsupportedOperationException at java.util.AbstractList.remove(AbstractList.java:638) at java.util.AbstractList$SimpleListIterator.remove(AbstractList.java:75) at java.util.AbstractList.removeRange(AbstractList.java:658) at java.util.AbstractList.clear(AbstractList.java:466) at android.widget.ArrayAdapter.clear(ArrayAdapter.java:273) at com.omarshehe.forminputkotlin.adapter.AutoCompleteAdapter$nameFilter$1.publishResults(AutoCompleteAdapter.kt:66) at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)