diff --git a/app/src/main/java/com/gh/gamecenter/ImageViewerActivity.kt b/app/src/main/java/com/gh/gamecenter/ImageViewerActivity.kt
index e01afdec38..b14def2324 100644
--- a/app/src/main/java/com/gh/gamecenter/ImageViewerActivity.kt
+++ b/app/src/main/java/com/gh/gamecenter/ImageViewerActivity.kt
@@ -368,7 +368,7 @@ class ImageViewerActivity : BaseActivity(), OnPageChangeListener {
                     if (mUseEnterAndExitAnimation) {
                         mBigImageView?.translationX = mTranslationX
                         mBigImageView?.translationY = mTranslationY
-                        if (mScaleX < Float.MAX_VALUE) {
+                        if (!mScaleX.isNaN() && mScaleX < Float.MAX_VALUE) {
                             mBigImageView?.scaleX = mScaleX
                             mBigImageView?.scaleY = mScaleY
                         }
@@ -439,10 +439,18 @@ class ImageViewerActivity : BaseActivity(), OnPageChangeListener {
             addUpdateListener { va -> mBigImageView?.y = (va.animatedValue as Float) }
         }
         val scaleYAnimator = ValueAnimator.ofFloat(1F, mScaleY).apply {
-            addUpdateListener { va -> mBigImageView?.scaleY = (va.animatedValue as Float) }
+            addUpdateListener { va ->
+                if (va.animatedValue is Float && !(va.animatedValue as Float).isNaN() && (va.animatedValue as Float) < Float.MAX_VALUE) {
+                    mBigImageView?.scaleY = (va.animatedValue as Float)
+                }
+            }
         }
         val scaleXAnimator = ValueAnimator.ofFloat(1F, mScaleX).apply {
-            addUpdateListener { va -> mBigImageView?.scaleX = (va.animatedValue as Float) }
+            addUpdateListener { va ->
+                if (va.animatedValue is Float && !(va.animatedValue as Float).isNaN() && (va.animatedValue as Float) < Float.MAX_VALUE) {
+                    mBigImageView?.scaleX = (va.animatedValue as Float)
+                }
+            }
         }
         val backgroundAlphaAnimation = ValueAnimator.ofFloat(1F, 0F).apply {
             addUpdateListener { va -> mBackgroundView.alpha = (va.animatedValue as Float) }
@@ -591,10 +599,18 @@ class ImageViewerActivity : BaseActivity(), OnPageChangeListener {
             addUpdateListener { va -> mBigImageView?.y = (va.animatedValue as Float) }
         }
         val scaleYAnimator = ValueAnimator.ofFloat(mScaleY, 1F).apply {
-            addUpdateListener { va -> mBigImageView?.scaleY = (va.animatedValue as Float) }
+            addUpdateListener { va ->
+                if (va.animatedValue is Float && !(va.animatedValue as Float).isNaN() && (va.animatedValue as Float) < Float.MAX_VALUE) {
+                    mBigImageView?.scaleY = (va.animatedValue as Float)
+                }
+            }
         }
         val scaleXAnimator = ValueAnimator.ofFloat(mScaleX, 1F).apply {
-            addUpdateListener { va -> mBigImageView?.scaleX = (va.animatedValue as Float) }
+            addUpdateListener { va ->
+                if (va.animatedValue is Float && !(va.animatedValue as Float).isNaN() && (va.animatedValue as Float) < Float.MAX_VALUE) {
+                    mBigImageView?.scaleX = (va.animatedValue as Float)
+                }
+            }
         }
         val backgroundAlphaAnimator = ValueAnimator.ofFloat(0F, 1F).apply {
             addUpdateListener { va -> mBackgroundView.alpha = (va.animatedValue as Float) }
@@ -625,8 +641,10 @@ class ImageViewerActivity : BaseActivity(), OnPageChangeListener {
 
         val scaleAnimator = ValueAnimator.ofFloat(scale, finalScale).apply {
             addUpdateListener { va ->
-                view.scaleX = (va.animatedValue as Float)
-                view.scaleY = (va.animatedValue as Float)
+                if (va.animatedValue is Float && !(va.animatedValue as Float).isNaN() && (va.animatedValue as Float) < Float.MAX_VALUE) {
+                    view.scaleX = (va.animatedValue as Float)
+                    view.scaleY = (va.animatedValue as Float)
+                }
             }
         }
         val translateXAnimator = ValueAnimator.ofFloat(view.x, finalTranslationX).apply {
diff --git a/app/src/main/java/com/gh/gamecenter/forum/detail/ForumArticleAskListFragment.kt b/app/src/main/java/com/gh/gamecenter/forum/detail/ForumArticleAskListFragment.kt
index 31cdb894e6..5835bdaf78 100644
--- a/app/src/main/java/com/gh/gamecenter/forum/detail/ForumArticleAskListFragment.kt
+++ b/app/src/main/java/com/gh/gamecenter/forum/detail/ForumArticleAskListFragment.kt
@@ -269,7 +269,7 @@ class ForumArticleAskListFragment : LazyListFragment<AnswerEntity, ForumArticleA
     }
 
     override fun scrollToTop() {
-        mListRv.scrollToPosition(0)
+        mListRv?.scrollToPosition(0)
     }
 
     override fun addSyncPageObserver(): Boolean = true
diff --git a/app/src/main/java/com/gh/gamecenter/gamedetail/GameDetailFragment.kt b/app/src/main/java/com/gh/gamecenter/gamedetail/GameDetailFragment.kt
index a9cba44ba0..0e3564da3b 100644
--- a/app/src/main/java/com/gh/gamecenter/gamedetail/GameDetailFragment.kt
+++ b/app/src/main/java/com/gh/gamecenter/gamedetail/GameDetailFragment.kt
@@ -479,6 +479,7 @@ class GameDetailFragment : ToolbarFragment(), IScrollable {
 
     private fun initGameSubtitle(gameTitleTv: TextView, gameSubtitle: String, gameSubtitleStyle: TagStyleEntity? = null, advanceDownload: Boolean = false) {
         gameTitleTv.post {
+            if (!isAdded) return@post
             gameTitleTv.run {
                 var lastPosX = 0F
                 tryCatchInRelease {
@@ -552,6 +553,7 @@ class GameDetailFragment : ToolbarFragment(), IScrollable {
     }
 
     private fun subtractGameNameIfNeeded(textView: TextView, name: CharSequence, tagLayout: FrameLayout) {
+        if (!isAdded) return
         textView.run {
             if (lineCount > 2 || (layout != null && layout.getEllipsisCount(1) > 0)) {
                 val displayName = name.substring(0, name.length - 2) + "…"