diff --git a/android/src/main/java/com/flutter/moum/screenshot_callback/ScreenshotCallbackPlugin.java b/android/src/main/java/com/flutter/moum/screenshot_callback/ScreenshotCallbackPlugin.java
index 57caddd..4ce12be 100644
--- a/android/src/main/java/com/flutter/moum/screenshot_callback/ScreenshotCallbackPlugin.java
+++ b/android/src/main/java/com/flutter/moum/screenshot_callback/ScreenshotCallbackPlugin.java
@@ -61,7 +61,9 @@ public Unit invoke(String screenshotName) {
                         handler.post(new Runnable() {
                             @Override
                             public void run() {
-                                channel.invokeMethod("onCallback", null);
+                                if(channel != null) {
+                                    channel.invokeMethod("onCallback", null);
+                                }
                             }
                         });
                     }