title: JavaFX ComboBox Crash
body: <p>After using ComboBoxes in an IntelliJ JavaFX application for many months without any crashes or errors, my program now crashes whenever I try to click on a ComboBox.</p>
  
  <p>I decided to do some investigating by creating a new project with just a ComboBox in a TilePane, when I click on it the same thing happens.</p>
  
  <p>Here is the error I get:</p>
  
  <p><a href="https://i.stack.imgur.com/KMQyM.png" rel="nofollow noreferrer">Fatal Error</a></p>
  
  <p>Here is the code that produces the error:</p>
  
  <pre><code>import javafx.application.Application;
  import javafx.geometry.Orientation;
  import javafx.scene.Scene;
  import javafx.scene.control.ComboBox;
  import javafx.scene.layout.TilePane;
  import javafx.scene.layout.VBox;
  import javafx.stage.Stage;
  
  public class Main extends Application {
  
      public static void main(String[] args) {
          launch(args);
      }
  
      @Override
      public void start(Stage s) {
          int width = 1600;
          int height = 900;
          TilePane r = new TilePane(Orientation.VERTICAL);
          Scene sc = new Scene(r, width, height);
          VBox vbox = new VBox();
          s.setScene(sc);
          s.show();
          ComboBox testBox = new ComboBox();
  
          for (int i = 1; i &lt;= 10; i++) {
              testBox.getItems().add(i);
          }
          r.getChildren().add(testBox);
      }
  }
  
  </code></pre>
  
  <p>As far as I can tell, this is how ComboBoxes are supposed to be used, although I may be wrong.</p>
  
  <p>Any ideas?</p>