make sure the video fragment still exists when the video completes

app/src/main/kotlin/com/simplemobiletools/gallery/fragments/VideoFragment.kt

@@ -464,6 +464,10 @@ class VideoFragment : ViewPagerFragment(), SurfaceHolder.Callback, SeekBar.OnSee
     }
 
     private fun videoCompleted() {
+        if (!isAdded) {
+            return
+        }
+
         if (listener?.videoEnded() == false && context.config.loopVideos) {
             playVideo()
         } else {

app/src/main/kotlin/com/simplemobiletools/gallery/fragments/ViewPagerFragment.kt

@@ -20,8 +20,9 @@ abstract class ViewPagerFragment : Fragment() {
 
     fun getMediumExtendedDetails(medium: Medium): String {
         val file = File(medium.path)
-        if (!file.exists())
+        if (!file.exists()) {
             return ""
+        }
 
         val path = "${file.parent.trimEnd('/')}/"
         val exif = android.media.ExifInterface(medium.path)