Prevent crash

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -4190,21 +4190,28 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     String thread = args.getString("thread");
                     long id = args.getLong("id");
 
+                    EntityAccount account;
+                    EntityFolder trash;
+                    EntityFolder archive;
+
+                    boolean trashable = false;
+                    boolean snoozable = false;
+                    boolean archivable = false;
+
                     DB db = DB.getInstance(context);
+                    try {
+                        db.beginTransaction();
 
-                    EntityAccount account = db.account().getAccount(aid);
+                        account = db.account().getAccount(aid);
                         if (account != null && account.color != null)
                             args.putInt("color", account.color);
 
-                    EntityFolder trash = db.folder().getFolderByType(aid, EntityFolder.TRASH);
-                    EntityFolder archive = db.folder().getFolderByType(aid, EntityFolder.ARCHIVE);
+                        trash = db.folder().getFolderByType(aid, EntityFolder.TRASH);
+                        archive = db.folder().getFolderByType(aid, EntityFolder.ARCHIVE);
 
                         List<EntityMessage> messages = db.message().getMessagesByThread(
                                 aid, thread, threading ? null : id, null);
 
-                    boolean trashable = false;
-                    boolean snoozable = false;
-                    boolean archivable = false;
                         for (EntityMessage message : messages) {
                             EntityFolder folder = db.folder().getFolder(message.folder);
 
@@ -4227,8 +4234,14 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                                 archivable = true;
                         }
 
+                        db.setTransactionSuccessful();
+                    } finally {
+                        db.endTransaction();
+                    }
+
                     return new Boolean[]{
-                            trash == null || account.protocol == EntityAccount.TYPE_POP,
+                            trash == null ||
+                                    (account != null && account.protocol == EntityAccount.TYPE_POP),
                             trashable,
                             snoozable,
                             archivable && archive != null};