diff --git a/libraries/chain/db_update.cpp b/libraries/chain/db_update.cpp
index 9e52b933ed..100c4b8a3a 100644
--- a/libraries/chain/db_update.cpp
+++ b/libraries/chain/db_update.cpp
@@ -39,6 +39,8 @@
 
 #include <graphene/protocol/fee_schedule.hpp>
 
+#include <fc/log/logger.hpp>
+
 namespace graphene { namespace chain {
 
 void database::update_global_dynamic_data( const signed_block& b, const uint32_t missed_blocks )
@@ -63,9 +65,16 @@ void database::update_global_dynamic_data( const signed_block& b, const uint32_t
       dgp.head_block_id = b.id();
       dgp.time = b.timestamp;
       dgp.current_witness = b.witness;
-      dgp.recent_slots_filled = (
-           (dgp.recent_slots_filled << 1)
-           + 1) << missed_blocks;
+
+      if (missed_blocks >= 128) { // we must avoid calculating bitshift (A<<B) for B equal-or-larger than number of bits in A
+         wlog("big value of missed_blocks=${missed_blocks}", ("missed_blocks",missed_blocks));
+         dgp.recent_slots_filled = 0; // any 128 bit value left-shifted by 128 or more - becomes a zero
+      }
+      else {
+         dgp.recent_slots_filled = (
+              (dgp.recent_slots_filled << 1)
+              + 1) << missed_blocks;
+      }
       dgp.current_aslot += missed_blocks+1;
    });