Try fetching shares.

lib/pleroma/web/ostatus/ostatus.ex

@@ -63,8 +63,7 @@ def make_share(entry, doc, retweeted_activity) do
   end
 
   def handle_share(entry, doc) do
-    with [object] <- :xmerl_xpath.string('/entry/activity:object', entry),
-         {:ok, retweeted_activity} <-  handle_note(object, object),
+    with {:ok, retweeted_activity} <- get_or_build_object(entry),
          {:ok, activity} <- make_share(entry, doc, retweeted_activity) do
       {:ok, activity, retweeted_activity}
     else
@@ -81,6 +80,18 @@ def make_favorite(entry, doc, favorited_activity) do
     end
   end
 
+  def get_or_build_object(entry) do
+    with {:ok, activity} <- get_or_try_fetching(entry) do
+      {:ok, activity}
+    else
+      _e ->
+        with [object] <- :xmerl_xpath.string('/entry/activity:object', entry) do
+          handle_note(object, object)
+        end
+    end
+  end
+
+
   def get_or_try_fetching(entry) do
     Logger.debug("Trying to get entry from db")
     with id when not is_nil(id) <- string_from_xpath("//activity:object[1]/id", entry),