diff --git a/android/app/src/main/java/app/organicmaps/MwmActivity.java b/android/app/src/main/java/app/organicmaps/MwmActivity.java
index 2c1199072e..3bc77494a3 100644
--- a/android/app/src/main/java/app/organicmaps/MwmActivity.java
+++ b/android/app/src/main/java/app/organicmaps/MwmActivity.java
@@ -1041,6 +1041,11 @@ public class MwmActivity extends BaseMwmFragmentActivity
     {
       UiUtils.show(mPointChooser);
       mMapButtonsViewModel.setButtonsHidden(true);
+      if (mPointChooserMode == PointChooserMode.NONE)
+      {
+        // BUG: https://github.com/organicmaps/organicmaps/issues/3945
+        throw new IllegalStateException("Unexpected mPositionChooserMode == NONE in ChoosePositionMode");
+      }
     }
     if (mOnmapDownloader != null)
       mOnmapDownloader.onResume();