diff --git a/common/src/main/java/com/yunbao/common/manager/OpenAdManager.java b/common/src/main/java/com/yunbao/common/manager/OpenAdManager.java
index b49247ddd..1807686db 100644
--- a/common/src/main/java/com/yunbao/common/manager/OpenAdManager.java
+++ b/common/src/main/java/com/yunbao/common/manager/OpenAdManager.java
@@ -54,10 +54,18 @@ public class OpenAdManager {
     }
 
     public void clear() {
-        runnableMap.clear();
-        showMap.clear();
-        list.clear();
-        waitRunnableMap.clear();
+        if (runnableMap != null) {
+            runnableMap.clear();
+        }
+        if (showMap != null) {
+            showMap.clear();
+        }
+        if (list != null) {
+            list.clear();
+        }
+        if (waitRunnableMap != null) {
+            waitRunnableMap.clear();
+        }
         list = null;
         runNowRunnable = null;
     }