diff --git a/build.gradle b/build.gradle
index 51cdacf..cd0d4d5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     jcenter()
   }
   dependencies {
-    classpath 'com.android.tools.build:gradle:3.3.0-alpha13'
+    classpath 'com.android.tools.build:gradle:3.4.0-alpha01'
     // NOTE: Do not place your application dependencies here; they belong
     // in the individual module build.gradle files
     classpath 'com.novoda:bintray-release:0.5.0'
diff --git a/library/src/main/java/com/linchaolong/android/imagepicker/ImagePicker.java b/library/src/main/java/com/linchaolong/android/imagepicker/ImagePicker.java
index 4f6d4ba..99464f7 100644
--- a/library/src/main/java/com/linchaolong/android/imagepicker/ImagePicker.java
+++ b/library/src/main/java/com/linchaolong/android/imagepicker/ImagePicker.java
@@ -359,12 +359,16 @@ private void handlePickImageInner(Activity activity, Fragment fragment, Uri imag
     // 打开裁剪图片界面
     CropImage.ActivityBuilder builder = CropImage.activity(imageUri);
     // 裁剪配置
-    callback.cropConfig(builder);
+    if (callback != null) {
+      callback.cropConfig(builder);
+    }
     // 启动裁剪界面
     if (activity != null) {
       builder.start(activity);
     }else{
-      builder.start(fragment.getActivity(), fragment);
+      if (fragment.getActivity() != null) {
+        builder.start(fragment.getActivity(), fragment);
+      }
     }
   }