diff --git a/libraries/chain/db_block.cpp b/libraries/chain/db_block.cpp
index bd917960..e11c50f7 100644
--- a/libraries/chain/db_block.cpp
+++ b/libraries/chain/db_block.cpp
@@ -62,6 +62,17 @@ namespace {
       
       std::vector<fc::sha256> proposed_operations_digests;
    };
+   
+   std::vector<fc::sha256> gather_proposed_operations_digests(const graphene::chain::transaction& trx)
+   {
+      proposed_operations_digest_accumulator digest_accumulator;
+      for (auto& operation: trx.operations)
+      {
+         operation.visit(digest_accumulator);
+      }
+       
+      return digest_accumulator.proposed_operations_digests;
+   }
 }
 
 namespace graphene { namespace chain {
@@ -145,22 +156,12 @@ void database::check_tansaction_for_duplicated_operations(const signed_transacti
    
    for (auto& pending_transaction: _pending_tx)
    {
-      proposed_operations_digest_accumulator digest_accumulator;
-      for (auto& operation: pending_transaction.operations)
-      {
-         operation.visit(digest_accumulator);
-      }
-       
-      existed_operations_digests.insert(digest_accumulator.proposed_operations_digests.begin(), digest_accumulator.proposed_operations_digests.end());
+      auto proposed_operations_digests = gather_proposed_operations_digests(pending_transaction);
+      existed_operations_digests.insert(proposed_operations_digests.begin(), proposed_operations_digests.end());
    }
     
-   proposed_operations_digest_accumulator digest_accumulator;
-   for (auto& operation: trx.operations)
-   {
-      operation.visit(digest_accumulator);
-   }
-    
-   for (auto& digest: digest_accumulator.proposed_operations_digests)
+   auto proposed_operations_digests = gather_proposed_operations_digests(trx);
+   for (auto& digest: proposed_operations_digests)
    {
       FC_ASSERT(existed_operations_digests.count(digest) == 0, "Proposed operation is already pending for approval.");
    }