diff --git a/Thermo.Active.NC/NcAdapter.cs b/Thermo.Active.NC/NcAdapter.cs
index 1e8ece97..1e99891f 100644
--- a/Thermo.Active.NC/NcAdapter.cs
+++ b/Thermo.Active.NC/NcAdapter.cs
@@ -2569,8 +2569,10 @@ namespace Thermo.Active.NC
 
             ThermoModels.HistorySheet sheetRaw = new ThermoModels.HistorySheet();
             libraryError = numericalControl.PLC_RHistorySheets(ref sheetRaw);
+            if (libraryError.IsError())
+                return libraryError;
 
-            if(sheetRaw.newData)
+            if (sheetRaw.newData)
             {
 
                 using (HistorySheetsController HSC = new HistorySheetsController())