Fixed NPE on Laf change in spinner ui.

core/src/main/java/com/github/weisj/darklaf/ui/spinner/DarkSpinnerUI.java

@@ -111,6 +111,9 @@ public class DarkSpinnerUI extends BasicSpinnerUI implements PropertyChangeListe
     @Override
     protected void uninstallListeners() {
         super.uninstallListeners();
+        if (editor != null && editor.getComponents().length > 0) {
+            editor.getComponents()[0].removeFocusListener(focusListener);
+        }
         spinner.removeMouseListener(mouseListener);
         spinner.removePropertyChangeListener(this);
     }
@@ -185,6 +188,10 @@ public class DarkSpinnerUI extends BasicSpinnerUI implements PropertyChangeListe
         if (oldEditor != null && oldEditor.getComponents().length > 0) {
             oldEditor.getComponents()[0].removeFocusListener(focusListener);
         }
+        editor = newEditor;
+        if (oldEditor != null && oldEditor.getComponents().length > 0) {
+            oldEditor.getComponents()[0].removeFocusListener(focusListener);
+        }
         if (newEditor != null && newEditor.getComponents().length > 0) {
             Component comp = newEditor.getComponents()[0];
             comp.addFocusListener(focusListener);