fix: clicking on back button after post creation

Author: Dima Alipov

Diff for: src/discussions/posts/data/hooks.js

@@ -11,10 +11,12 @@ const usePostList = (ids) => {
 
   const sortedIds = useMemo(() => {
     posts.forEach((post) => {
-      if (post.pinned) {
-        pinnedPostsIds.push(post.id);
-      } else {
-        unpinnedPostsIds.push(post.id);
+      if (post) {
+        if (post.pinned) {
+          pinnedPostsIds.push(post.id);
+        } else {
+          unpinnedPostsIds.push(post.id);
+        }
       }
     });
 

Diff for: src/discussions/posts/data/slices.js

@@ -92,7 +92,7 @@ const threadsSlice = createSlice({
       if (!updatedPages[page - 1]) {
         updatedPages[page - 1] = ids;
       } else {
-        updatedPages[page - 1] = [...new Set([...updatedPages[page - 1], ...ids])];
+        updatedPages[page - 1] = [...new Set([updatedPages[page - 1], ...ids])];
       }
       newState.pages = updatedPages;