diff --git a/dsbridge/src/main/java/wendu/dsbridge/DWebView.java b/dsbridge/src/main/java/wendu/dsbridge/DWebView.java
index 0513243..acdf46b 100644
--- a/dsbridge/src/main/java/wendu/dsbridge/DWebView.java
+++ b/dsbridge/src/main/java/wendu/dsbridge/DWebView.java
@@ -679,6 +679,9 @@ public boolean onJsAlert(WebView view, String url, final String message, final J
                     return true;
                 }
             }
+
+            if (isActivityFinishing()) return true;
+
             Dialog alertDialog = new AlertDialog.Builder(getContext()).
                     setMessage(message).
                     setCancelable(false).
@@ -717,6 +720,9 @@ public void onClick(DialogInterface dialog, int which) {
                         }
                     }
                 };
+
+                if (isActivityFinishing()) return true;
+
                 new AlertDialog.Builder(getContext())
                         .setMessage(message)
                         .setCancelable(false)
@@ -765,6 +771,9 @@ public void onClick(DialogInterface dialog, int which) {
                         }
                     }
                 };
+
+                if (isActivityFinishing()) return true;
+
                 new AlertDialog.Builder(getContext())
                         .setTitle(message)
                         .setView(editText)
@@ -907,6 +916,22 @@ public void openFileChooser(ValueCallback valueCallback, String acceptType) {
 
     };
 
+    private boolean isActivityFinishing() {
+        Context context = getContext();
+        if (context instanceof Activity) {
+            Activity activity = (Activity) context;
+            if (activity.isFinishing()) {
+                return true;
+            }
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+                if (activity.isDestroyed()) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
     @Override
     public void clearCache(boolean includeDiskFiles) {
         super.clearCache(includeDiskFiles);