diff --git a/platform/platform-api/src/com/intellij/ui/CheckBoxList.java b/platform/platform-api/src/com/intellij/ui/CheckBoxList.java
index 4bf4d2f3b242..01b18514b9e7 100644
--- a/platform/platform-api/src/com/intellij/ui/CheckBoxList.java
+++ b/platform/platform-api/src/com/intellij/ui/CheckBoxList.java
@@ -135,9 +135,11 @@ public class CheckBoxList<T> extends JBList<JCheckBox> {
         private void setPressed(MouseEvent e, boolean pressed) {
           Point point = e.getPoint();
           int index = locationToIndex(point);
-          JCheckBox cb = getModel().getElementAt(index);
-          cb.getModel().setPressed(pressed);
-          UIUtil.repaintViewport(CheckBoxList.this);
+          if (index >= 0 && index < getModel().getSize()) {
+            JCheckBox cb = getModel().getElementAt(index);
+            cb.getModel().setPressed(pressed);
+            UIUtil.repaintViewport(CheckBoxList.this);
+          }
         }
       });
     }