2 files changed, 6 insertions, 1 deletions
diff --git a/src/common/threadpool.cpp b/src/common/threadpool.cpp
index 18204eeee..753bf238c 100644
--- a/src/common/threadpool.cpp
+++ b/src/common/threadpool.cpp
@@ -71,6 +71,7 @@ void threadpool::recycle() {
 }
 
 void threadpool::create(unsigned int max_threads) {
+  const boost::unique_lock<boost::mutex> lock(mutex);
   boost::thread::attributes attrs;
   attrs.set_stack_size(THREAD_STACK_SIZE);
   max = max_threads ? max_threads : tools::get_max_concurrency();
diff --git a/src/cryptonote_core/tx_pool.cpp b/src/cryptonote_core/tx_pool.cpp
index 05cbf14a8..53a6ce579 100644
--- a/src/cryptonote_core/tx_pool.cpp
+++ b/src/cryptonote_core/tx_pool.cpp
@@ -1283,7 +1283,11 @@ namespace cryptonote
     fee = 0;
     
     //baseline empty block
-    get_block_reward(median_weight, total_weight, already_generated_coins, best_coinbase, version);
+    if (!get_block_reward(median_weight, total_weight, already_generated_coins, best_coinbase, version))
+    {
+      MERROR("Failed to get block reward for empty block");
+      return false;
+    }
 
 
     size_t max_total_weight_pre_v5 = (130 * median_weight) / 100 - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE;