diff --git a/td/telegram/StickersManager.cpp b/td/telegram/StickersManager.cpp
index a422c2c0..e9163a53 100644
--- a/td/telegram/StickersManager.cpp
+++ b/td/telegram/StickersManager.cpp
@@ -1774,9 +1774,9 @@ bool StickersManager::merge_stickers(FileId new_id, FileId old_id, bool can_dele
     Sticker *new_ = new_it->second.get();
     CHECK(new_ != nullptr);
 
-    if (old_->alt != new_->alt || old_->set_id != new_->set_id ||
-        (!old_->is_animated && !new_->is_animated && old_->dimensions.width != 0 && old_->dimensions.height != 0 &&
-         old_->dimensions != new_->dimensions)) {
+    if (old_->set_id == new_->set_id && (old_->alt != new_->alt || old_->set_id != new_->set_id ||
+                                         (!old_->is_animated && !new_->is_animated && old_->dimensions.width != 0 &&
+                                          old_->dimensions.height != 0 && old_->dimensions != new_->dimensions))) {
       LOG(ERROR) << "Sticker has changed: alt = (" << old_->alt << ", " << new_->alt << "), set_id = (" << old_->set_id
                  << ", " << new_->set_id << "), dimensions = (" << old_->dimensions << ", " << new_->dimensions << ")";
     }