App crashes when locateUser()

[kamami]

Describe the bug
App crashes when locating user: locateUser(). With Flutter v1.5.8 everything worked fine, but I needed to upgrad, because of other plugins.

Expected behavior
App not crashing.

Tested on:

• Android, API Level 28, real device
• Flutter 1.6.6
• Location 2.3.5

E/AndroidRuntime( 4141): FATAL EXCEPTION: AsyncTask #3
E/AndroidRuntime( 4141): Process: com.kamami.insta, PID: 4141
E/AndroidRuntime( 4141): java.lang.RuntimeException: An error occurred while executing doInBackground()
E/AndroidRuntime( 4141): at android.os.AsyncTask$3.done(AsyncTask.java:354)
E/AndroidRuntime( 4141): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
E/AndroidRuntime( 4141): at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
E/AndroidRuntime( 4141): at java.util.concurrent.FutureTask.run(FutureTask.java:271)
E/AndroidRuntime( 4141): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
E/AndroidRuntime( 4141): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
E/AndroidRuntime( 4141): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
E/AndroidRuntime( 4141): at java.lang.Thread.run(Thread.java:764)
E/AndroidRuntime( 4141): Caused by: java.lang.RuntimeException: Methods marked with @UiThread must be executed on the main thread. Current thread: AsyncTask #3
E/AndroidRuntime( 4141): at io.flutter.embedding.engine.FlutterJNI.ensureRunningOnMainThread(FlutterJNI.java:605)
E/AndroidRuntime( 4141): at io.flutter.embedding.engine.FlutterJNI.invokePlatformMessageResponseCallback(FlutterJNI.java:556)
E/AndroidRuntime( 4141): at io.flutter.embedding.engine.dart.DartMessenger$Reply.reply(DartMessenger.java:131)
E/AndroidRuntime( 4141): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler$1.success(MethodChannel.java:225)
E/AndroidRuntime( 4141): at com.aloisdeniel.geocoder.GeocoderPlugin$2.doInBackground(GeocoderPlugin.java:109)
E/AndroidRuntime( 4141): at com.aloisdeniel.geocoder.GeocoderPlugin$2.doInBackground(GeocoderPlugin.java:102)
E/AndroidRuntime( 4141): at android.os.AsyncTask$2.call(AsyncTask.java:333)
E/AndroidRuntime( 4141): at java.util.concurrent.FutureTask.run(FutureTask.java:266)
E/AndroidRuntime( 4141): ... 4 more
I/Process ( 4141): Sending signal. PID: 4141 SIG: 9
Lost connection to device.