Fix crash when closing Spell Shop

forge-gui/src/main/java/forge/gui/toolbox/FSkin.java

@@ -96,6 +96,10 @@ public enum FSkin {
             this.comp = comp0;
         }
 
+        public boolean isDisposed() {
+            return this.comp == null;
+        }
+
         public SkinColor getForeground() {
             return this.foreground;
         }

forge-gui/src/main/java/forge/gui/toolbox/itemmanager/views/ItemListView.java

@@ -94,7 +94,7 @@ public final class ItemListView<T extends InventoryItem> extends ItemView<T> {
         this.table.addFocusListener(new FocusListener() {
             @Override
             public void focusLost(FocusEvent e) {
-                if (!e.isTemporary()) {
+                if (!e.isTemporary() && !skin.isDisposed()) {
                     skin.setSelectionBackground(FSkin.getColor(FSkin.Colors.CLR_INACTIVE));
                 }
             }