diff --git a/td/telegram/Photo.cpp b/td/telegram/Photo.cpp
index 3da73201..f41d24f5 100644
--- a/td/telegram/Photo.cpp
+++ b/td/telegram/Photo.cpp
@@ -290,12 +290,12 @@ Variant<PhotoSize, string> get_photo_size(FileManager *file_manager, FileType fi
                                           std::string upload_file_reference, DialogId owner_dialog_id,
                                           tl_object_ptr<telegram_api::PhotoSize> &&size_ptr, bool is_webp,
                                           bool is_png) {
+  CHECK(size_ptr != nullptr);
+
   tl_object_ptr<telegram_api::FileLocation> location_ptr;
   string type;
-
   PhotoSize res;
   BufferSlice content;
-
   switch (size_ptr->get_id()) {
     case telegram_api::photoSizeEmpty::ID:
       return std::move(res);
diff --git a/td/telegram/StickersManager.cpp b/td/telegram/StickersManager.cpp
index a001d562..d2c94c73 100644
--- a/td/telegram/StickersManager.cpp
+++ b/td/telegram/StickersManager.cpp
@@ -1622,19 +1622,22 @@ int64 StickersManager::on_get_sticker_set(tl_object_ptr<telegram_api::stickerSet
   bool is_official = (set->flags_ & telegram_api::stickerSet::OFFICIAL_MASK) != 0;
   bool is_masks = (set->flags_ & telegram_api::stickerSet::MASKS_MASK) != 0;
 
-  auto photo_size = get_photo_size(td_->file_manager_.get(), FileType::Thumbnail, 0, 0, "", DialogId(),
-                                   std::move(set->thumb_), true, false);
   PhotoSize thumbnail;
-  if (photo_size.get_offset() == 0) {
-    thumbnail = std::move(photo_size.get<0>());
-  } else {
-    LOG(ERROR) << "Receive minithumbnail for a sticker set " << set_id;
+  if (set->thumb_ != nullptr) {
+    auto photo_size = get_photo_size(td_->file_manager_.get(), FileType::Thumbnail, 0, 0, "", DialogId(),
+                                     std::move(set->thumb_), true, false);
+    if (photo_size.get_offset() == 0) {
+      thumbnail = std::move(photo_size.get<0>());
+    } else {
+      LOG(ERROR) << "Receive minithumbnail for a sticker set " << set_id;
+    }
   }
   if (!s->is_inited) {
     s->is_inited = true;
     s->title = std::move(set->title_);
     s->short_name = std::move(set->short_name_);
     s->thumbnail = std::move(thumbnail);
+    s->is_thumbnail_reloaded = true;
     s->sticker_count = set->count_;
     s->hash = set->hash_;
     s->is_official = is_official;
@@ -1672,6 +1675,10 @@ int64 StickersManager::on_get_sticker_set(tl_object_ptr<telegram_api::stickerSet
       s->thumbnail = std::move(thumbnail);
       s->is_changed = true;
     }
+    if (!s->is_thumbnail_reloaded) {
+      s->is_thumbnail_reloaded = true;
+      s->is_changed = true;
+    }
 
     if (s->sticker_count != set->count_ || s->hash != set->hash_) {
       s->is_loaded = false;
@@ -2770,6 +2777,9 @@ void StickersManager::on_load_sticker_set_from_database(int64 sticker_set_id, bo
     }
     status.ensure();
   }
+  if (!sticker_set->is_thumbnail_reloaded) {
+    reload_sticker_set(sticker_set_id, get_input_sticker_set(sticker_set), Auto());
+  }
 
   if (with_stickers && old_sticker_count < 5 && old_sticker_count < sticker_set->sticker_ids.size()) {
     sticker_set->is_changed = true;
diff --git a/td/telegram/StickersManager.h b/td/telegram/StickersManager.h
index 0afa07a9..f870ccc4 100644
--- a/td/telegram/StickersManager.h
+++ b/td/telegram/StickersManager.h
@@ -287,6 +287,7 @@ class StickersManager : public Actor {
     bool is_official = false;
     bool is_masks = false;
     bool is_viewed = true;
+    bool is_thumbnail_reloaded = false;
     bool is_changed = true;
 
     vector<uint32> load_requests;
diff --git a/td/telegram/StickersManager.hpp b/td/telegram/StickersManager.hpp
index d19108d4..66ad9185 100644
--- a/td/telegram/StickersManager.hpp
+++ b/td/telegram/StickersManager.hpp
@@ -122,6 +122,7 @@ void StickersManager::store_sticker_set(const StickerSet *sticker_set, bool with
   STORE_FLAG(sticker_set->is_viewed);
   STORE_FLAG(has_expires_at);
   STORE_FLAG(has_thumbnail);
+  STORE_FLAG(sticker_set->is_thumbnail_reloaded);
   END_STORE_FLAGS();
   store(sticker_set->id, storer);
   store(sticker_set->access_hash, storer);
@@ -177,6 +178,7 @@ void StickersManager::parse_sticker_set(StickerSet *sticker_set, ParserT &parser
   PARSE_FLAG(sticker_set->is_viewed);
   PARSE_FLAG(has_expires_at);
   PARSE_FLAG(has_thumbnail);
+  PARSE_FLAG(sticker_set->is_thumbnail_reloaded);
   END_PARSE_FLAGS();
   int64 sticker_set_id;
   int64 access_hash;