anchor.diff:      end;
       DataBuffer.Read(b_start,4);
       DataBuffer.Read(b_end,4);
  -    if (b_start<0) Or (b_start>b_end) Or (b_start>=TNode.Node.Bank.BlocksCount) then begin
  +    if (b_start<0) Or (b_start>b_end) then begin
         errors := 'Invalid start ('+Inttostr(b_start)+') or end ('+Inttostr(b_end)+') of count ('+Inttostr(TNode.Node.Bank.BlocksCount)+')';
         exit;
       end;
   
       DoDisconnect := false;
  +
  +    if (b_start>=TNode.Node.Bank.BlocksCount) then begin
  +      SendError(ntp_response,HeaderData.operation,HeaderData.request_id,CT_NetError_NotFound,Format('Block %d not found',[b_start]));
  +      Exit;
  +    end;
   
       if (b_end>=TNode.Node.Bank.BlocksCount) then b_end := TNode.Node.Bank.BlocksCount-1;
       inc_b := ((b_end - b_start) DIV CT_Max_Positions)+1;
  
positive.code: 
    CT_NetError_InvalidProtocolVersion = $0001;
    CT_NetError_IPBlackListed = $0002;
    CT_NetError_InvalidDataBufferInfo = $0010;
    CT_NetError_InternalServerError = $0011;
    CT_NetError_InvalidNewAccount = $0012;
  
negative.code:           end;
          end;
          // Send & wait
          if Not DoSendAndWaitForResponse(CT_NetOp_GetBlockchainOperations,TNetData.NetData.NewRequestId,sendStream,receiveStream,5000,headerData) then begin
            TLog.NewLog(ltdebug,ClassName,Format('Not received Pending operations (%d of %d) in Fast propagation block %d',[notFoundOpReferencesCount,oprefcount,operationsComp.OperationBlock.block]));
            Exit;
          end;
  