diff --git a/app/src/main/java/app/fedilab/android/activities/HashTagActivity.java b/app/src/main/java/app/fedilab/android/activities/HashTagActivity.java
index 4843f467..d95d5d6f 100644
--- a/app/src/main/java/app/fedilab/android/activities/HashTagActivity.java
+++ b/app/src/main/java/app/fedilab/android/activities/HashTagActivity.java
@@ -109,6 +109,7 @@ public class HashTagActivity extends BaseActivity {
                 pinned = new Pinned();
                 pinned.pinnedTimelines = new ArrayList<>();
             }
+            this.pinned = pinned;
             pinnedTag = false;
             if (pinned.pinnedTimelines != null) {
                 for (PinnedTimeline pinnedTimeline : pinned.pinnedTimelines) {
@@ -173,6 +174,9 @@ public class HashTagActivity extends BaseActivity {
                 unpinConfirm.setMessage(getString(R.string.unpin_timeline_description));
                 unpinConfirm.setNegativeButton(R.string.cancel, (dialog, which) -> dialog.dismiss());
                 unpinConfirm.setPositiveButton(R.string.yes, (dialog, which) -> {
+                    if (pinned == null || pinned.pinnedTimelines == null) {
+                        return;
+                    }
                     pinned.pinnedTimelines.remove(pinnedTimeline);
                     try {
                         new Pinned(HashTagActivity.this).updatePinned(pinned);
diff --git a/app/src/main/java/app/fedilab/android/activities/MediaActivity.java b/app/src/main/java/app/fedilab/android/activities/MediaActivity.java
index c0a35a93..1c1c02af 100644
--- a/app/src/main/java/app/fedilab/android/activities/MediaActivity.java
+++ b/app/src/main/java/app/fedilab/android/activities/MediaActivity.java
@@ -113,6 +113,10 @@ public class MediaActivity extends BaseTransparentActivity implements OnDownload
             attachments = (ArrayList<Attachment>) b.getSerializable(Helper.ARG_MEDIA_ARRAY);
             status = (Status) b.getSerializable(Helper.ARG_STATUS);
         }
+        if (getSupportActionBar() != null) {
+            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+            getSupportActionBar().setDisplayShowHomeEnabled(true);
+        }
 
         if (attachments == null || attachments.size() == 0)
             finish();
diff --git a/app/src/main/java/app/fedilab/android/ui/fragment/media/FragmentMediaProfile.java b/app/src/main/java/app/fedilab/android/ui/fragment/media/FragmentMediaProfile.java
index fe42a549..160ca018 100644
--- a/app/src/main/java/app/fedilab/android/ui/fragment/media/FragmentMediaProfile.java
+++ b/app/src/main/java/app/fedilab/android/ui/fragment/media/FragmentMediaProfile.java
@@ -90,7 +90,7 @@ public class FragmentMediaProfile extends Fragment {
 
                 @Override
                 public void federatedAccount(Account account) {
-                    if (account != null) {
+                    if (account != null && !requireActivity().isFinishing() && isAdded()) {
                         accountId = account.id;
                         accountsVM.getAccountStatuses(tempInstance, null, accountId, null, null, null, null, null, true, false, MastodonHelper.statusesPerCall(requireActivity()))
                                 .observe(getViewLifecycleOwner(), statuses -> initializeStatusesCommonView(statuses));
diff --git a/app/src/main/java/app/fedilab/android/ui/fragment/timeline/FragmentMastodonTimeline.java b/app/src/main/java/app/fedilab/android/ui/fragment/timeline/FragmentMastodonTimeline.java
index 03021530..da9dd25b 100644
--- a/app/src/main/java/app/fedilab/android/ui/fragment/timeline/FragmentMastodonTimeline.java
+++ b/app/src/main/java/app/fedilab/android/ui/fragment/timeline/FragmentMastodonTimeline.java
@@ -1067,7 +1067,7 @@ public class FragmentMastodonTimeline extends Fragment implements StatusAdapter.
 
                         @Override
                         public void federatedAccount(Account account) {
-                            if (account != null) {
+                            if (account != null && !requireActivity().isFinishing() && isAdded()) {
                                 accountIDInRemoteInstance = account.id;
                                 accountsVM.getAccountStatuses(tempInstance, null, accountIDInRemoteInstance, null, null, null, null, null, false, true, MastodonHelper.statusesPerCall(requireActivity()))
                                         .observe(getViewLifecycleOwner(), pinnedStatuses -> accountsVM.getAccountStatuses(tempInstance, null, accountIDInRemoteInstance, null, null, null, exclude_replies, exclude_reblogs, media_only, false, MastodonHelper.statusesPerCall(requireActivity()))