diff --git a/designer-base/src/main/java/com/fr/design/mainframe/EastRegionContainerPane.java b/designer-base/src/main/java/com/fr/design/mainframe/EastRegionContainerPane.java
index a273828d84..c7c587563a 100644
--- a/designer-base/src/main/java/com/fr/design/mainframe/EastRegionContainerPane.java
+++ b/designer-base/src/main/java/com/fr/design/mainframe/EastRegionContainerPane.java
@@ -511,7 +511,10 @@ public class EastRegionContainerPane extends UIEastResizableContainer {
         UIUtil.invokeLaterIfNeeded(new Runnable() {
             @Override
             public void run() {
-                propertyItemMap.get(key).replaceContentPane(pane);
+                PropertyItem item = propertyItemMap.get(key);
+                if (item != null) {
+                    item.replaceContentPane(pane);
+                }
             }
         });
     }