commit 9a0927374f7d48ffda70cf1b1eb085f89e88f212
Author: leszek <leszek@koltunski.pl>
Date:   Mon Nov 20 13:12:17 2023 +0100

    bugfix.

diff --git a/src/main/java/org/distorted/main/MainActivity.java b/src/main/java/org/distorted/main/MainActivity.java
index 6f4615ea..3aebdc30 100644
--- a/src/main/java/org/distorted/main/MainActivity.java
+++ b/src/main/java/org/distorted/main/MainActivity.java
@@ -222,7 +222,7 @@ public class MainActivity extends AppCompatActivity implements RubikNetwork.Upda
       super.onConfigurationChanged(conf);
 
       getWindowWidth(conf);
-      mGrid.updateGrid(this,mScreenWidth);
+      if( mGrid!=null ) mGrid.updateGrid(this,mScreenWidth);
       }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////