fix some NPE

3 files changed, 24 insertions, 16 deletions

diff --git a/src/main/java/de/pixart/messenger/services/XmppConnectionService.java b/src/main/java/de/pixart/messenger/services/XmppConnectionService.java
index 90b2784a5..5ba0355a8 100644
--- a/src/main/java/de/pixart/messenger/services/XmppConnectionService.java
+++ b/src/main/java/de/pixart/messenger/services/XmppConnectionService.java
@@ -1734,7 +1734,7 @@ public class XmppConnectionService extends Service {
     }
 
     public void pushBookmarks(Account account) {
-        if (account.getXmppConnection().getFeatures().bookmarksConversion()) {
+        if (account.getXmppConnection() != null && account.getXmppConnection().getFeatures().bookmarksConversion()) {
             pushBookmarksPep(account);
         } else {
             pushBookmarksPrivateXml(account);
diff --git a/src/main/java/de/pixart/messenger/ui/ConferenceDetailsActivity.java b/src/main/java/de/pixart/messenger/ui/ConferenceDetailsActivity.java
index 8ac8868fc..0840fc3fc 100644
--- a/src/main/java/de/pixart/messenger/ui/ConferenceDetailsActivity.java
+++ b/src/main/java/de/pixart/messenger/ui/ConferenceDetailsActivity.java
@@ -221,20 +221,22 @@ public class ConferenceDetailsActivity extends XmppActivity implements OnConvers
         this.mAdvancedMode = getPreferences().getBoolean("advanced_muc_mode", false);
         this.binding.mucInfoMore.setVisibility(this.mAdvancedMode ? View.VISIBLE : View.GONE);
         this.binding.notificationStatusButton.setOnClickListener(this.mNotifyStatusClickListener);
-        this.binding.detailsMucAvatar.setOnClickListener(v -> {
-            final MucOptions mucOptions = mConversation.getMucOptions();
-            if (!mucOptions.hasVCards()) {
-                Toast.makeText(this, R.string.host_does_not_support_group_chat_avatars, Toast.LENGTH_SHORT).show();
-                return;
-            }
-            if (!mucOptions.getSelf().getAffiliation().ranks(MucOptions.Affiliation.OWNER)) {
-                Toast.makeText(this, R.string.only_the_owner_can_change_group_chat_avatar, Toast.LENGTH_SHORT).show();
-                return;
-            }
-            final Intent intent = new Intent(this, PublishGroupChatProfilePictureActivity.class);
-            intent.putExtra("uuid", mConversation.getUuid());
-            startActivity(intent);
-        });
+        if (mConversation != null) {
+            this.binding.detailsMucAvatar.setOnClickListener(v -> {
+                final MucOptions mucOptions = mConversation.getMucOptions();
+                if (!mucOptions.hasVCards()) {
+                    Toast.makeText(this, R.string.host_does_not_support_group_chat_avatars, Toast.LENGTH_SHORT).show();
+                    return;
+                }
+                if (!mucOptions.getSelf().getAffiliation().ranks(MucOptions.Affiliation.OWNER)) {
+                    Toast.makeText(this, R.string.only_the_owner_can_change_group_chat_avatar, Toast.LENGTH_SHORT).show();
+                    return;
+                }
+                final Intent intent = new Intent(this, PublishGroupChatProfilePictureActivity.class);
+                intent.putExtra("uuid", mConversation.getUuid());
+                startActivity(intent);
+            });
+        }
         this.binding.editMucNameButton.setOnClickListener(this::onMucEditButtonClicked);
         this.binding.mucEditTitle.addTextChangedListener(this);
         this.binding.mucEditSubject.addTextChangedListener(this);
diff --git a/src/main/java/de/pixart/messenger/utils/RichPreview.java b/src/main/java/de/pixart/messenger/utils/RichPreview.java
index e0bff1cf2..10e10b033 100644
--- a/src/main/java/de/pixart/messenger/utils/RichPreview.java
+++ b/src/main/java/de/pixart/messenger/utils/RichPreview.java
@@ -19,8 +19,10 @@ import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
+import java.io.UnsupportedEncodingException;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.net.URLEncoder;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.regex.Pattern;
@@ -134,7 +136,11 @@ public class RichPreview {
             } catch (URISyntaxException e) {
                 e.printStackTrace();
             }
-            base_uri = base_uri != null ? base_uri.resolve(part) : null;
+            try {
+                base_uri = base_uri != null ? base_uri.resolve(URLEncoder.encode(part, "UTF-8")) : null;
+            } catch (UnsupportedEncodingException e) {
+                e.printStackTrace();
+            }
             return base_uri != null ? base_uri.toString() : null;
         }
     }