Couple more sanity checks

src/side_chain.cpp

@@ -1118,6 +1118,11 @@ void SideChain::update_chain_tip(PoolBlock* block)
 		return;
 	}
 
+	if (block->m_depth >= m_chainWindowSize) {
+		LOGINFO(5, "Trying to update chain tip to a block with depth " << block->m_depth << ". Ignoring it.");
+		return;
+	}
+
 	if (is_longer_chain(m_chainTip, block)) {
 		difficulty_type diff;
 		if (get_difficulty(block, m_difficultyData, diff)) {

src/stratum_server.cpp

@@ -100,6 +100,10 @@ void StratumServer::on_block(const BlockTemplate& block)
 		m_blobsQueue.push_back(blobs_data);
 	}
 
+	if (uv_is_closing(reinterpret_cast<uv_handle_t*>(&m_blobsAsync))) {
+		return;
+	}
+
 	const int err = uv_async_send(&m_blobsAsync);
 	if (err) {
 		LOGERR(1, "uv_async_send failed, error " << uv_err_name(err));