diff --git a/cgeDemo/src/main/java/org/wysaid/cgeDemo/BasicImageDemoActivity.java b/cgeDemo/src/main/java/org/wysaid/cgeDemo/BasicImageDemoActivity.java
index 766c052d..7850bba9 100644
--- a/cgeDemo/src/main/java/org/wysaid/cgeDemo/BasicImageDemoActivity.java
+++ b/cgeDemo/src/main/java/org/wysaid/cgeDemo/BasicImageDemoActivity.java
@@ -215,6 +215,10 @@ public void saveImageBtnClicked(View view) {
         mImageView.getResultBitmap(new ImageGLSurfaceView.QueryResultBitmapCallback() {
             @Override
             public void get(Bitmap bmp) {
+                if(bmp == null) {
+                    MsgUtil.toastMsg(BasicImageDemoActivity.this, "Get bitmap failed!");
+                    return;
+                }
                 final String s = ImageUtil.saveBitmap(bmp);
                 sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + s)));
                 mImageView.post(new Runnable() {
diff --git a/cgeDemo/src/main/java/org/wysaid/cgeDemo/ImageDeformActivity.java b/cgeDemo/src/main/java/org/wysaid/cgeDemo/ImageDeformActivity.java
index 1ce17914..256648b0 100644
--- a/cgeDemo/src/main/java/org/wysaid/cgeDemo/ImageDeformActivity.java
+++ b/cgeDemo/src/main/java/org/wysaid/cgeDemo/ImageDeformActivity.java
@@ -256,6 +256,10 @@ public void saveImageBtnClicked(View view) {
         mImageView.getResultBitmap(new ImageGLSurfaceView.QueryResultBitmapCallback() {
             @Override
             public void get(final Bitmap bmp) {
+                if (bmp == null) {
+                    MsgUtil.toastMsg(ImageDeformActivity.this, "Get bitmap failed!");
+                    return;
+                }
                 String s = ImageUtil.saveBitmap(bmp);
                 sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + s)));
             }
diff --git a/cgeDemo/src/main/java/org/wysaid/cgeDemo/ImageDemoActivity.java b/cgeDemo/src/main/java/org/wysaid/cgeDemo/ImageDemoActivity.java
index 145e1153..47e9b7ea 100755
--- a/cgeDemo/src/main/java/org/wysaid/cgeDemo/ImageDemoActivity.java
+++ b/cgeDemo/src/main/java/org/wysaid/cgeDemo/ImageDemoActivity.java
@@ -73,6 +73,11 @@ public void onClick(View v) {
                 mImageView.getResultBitmap(new ImageGLSurfaceView.QueryResultBitmapCallback() {
                     @Override
                     public void get(final Bitmap bmp) {
+                        if(bmp == null) {
+                            MsgUtil.toastMsg(ImageDemoActivity.this, "Get bitmap failed!");
+                            return;
+                        }
+
                         String s = ImageUtil.saveBitmap(bmp);
                         sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + s)));
                     }
@@ -213,7 +218,10 @@ public void faceDetectTestCase(View view) {
         mImageView.getResultBitmap(new ImageGLSurfaceView.QueryResultBitmapCallback() {
             @Override
             public void get(final Bitmap bmp) {
-
+                if(bmp == null) {
+                    MsgUtil.toastMsg(ImageDemoActivity.this, "Get bitmap failed!");
+                    return;
+                }
                 mImageView.post(new Runnable() {
                     @Override
                     public void run() {
diff --git a/cgeDemo/src/main/java/org/wysaid/cgeDemo/TestCaseActivity.java b/cgeDemo/src/main/java/org/wysaid/cgeDemo/TestCaseActivity.java
index 022b6925..f86ba08b 100644
--- a/cgeDemo/src/main/java/org/wysaid/cgeDemo/TestCaseActivity.java
+++ b/cgeDemo/src/main/java/org/wysaid/cgeDemo/TestCaseActivity.java
@@ -167,6 +167,11 @@ public void run() {
                     //To accelerate this, you can add a Bitmap arg for "getResultBitmap",
                     // and reuse the Bitmap instead of recycle it every time.
                     Bitmap dst = handler.getResultBitmap();
+                    if(dst == null) {
+                        Log.e(LOG_TAG, "getResultBitmap returns null!");
+                        continue;
+                    }
+
                     String s = ImageUtil.saveBitmap(dst);
                     dst.recycle();  //Maybe reuse it will be better.
 
diff --git a/library/src/main/jni/interface/cgeImageHandlerAndroid.cpp b/library/src/main/jni/interface/cgeImageHandlerAndroid.cpp
index ff218397..8ec51721 100644
--- a/library/src/main/jni/interface/cgeImageHandlerAndroid.cpp
+++ b/library/src/main/jni/interface/cgeImageHandlerAndroid.cpp
@@ -95,6 +95,12 @@ bool CGEImageHandlerAndroid::initWithBitmap(JNIEnv* env, jobject bmp, bool enabl
 
 jobject CGEImageHandlerAndroid::getResultBitmap(JNIEnv* env)
 {
+    if(m_dstImageSize.width <= 0 || m_dstImageSize.height <= 0)
+    {
+        CGE_LOG_ERROR("Invalid image size!");
+        return nullptr;
+    }
+
     jclass bitmapCls = env->FindClass("android/graphics/Bitmap");
 
     jmethodID createBitmapFunction = env->GetStaticMethodID(bitmapCls, "createBitmap", "(IILandroid/graphics/Bitmap$Config;)Landroid/graphics/Bitmap;");