diff --git a/TimeSeriesAnalysis.Tests/Tests/PlantSimulatorSerialization.cs b/TimeSeriesAnalysis.Tests/Tests/PlantSimulatorSerialization.cs
index d869812..b0e9062 100644
--- a/TimeSeriesAnalysis.Tests/Tests/PlantSimulatorSerialization.cs
+++ b/TimeSeriesAnalysis.Tests/Tests/PlantSimulatorSerialization.cs
@@ -97,7 +97,9 @@ public void DeserializedPlantSimulatorAndTimeSeriesDataObjects_AreAbleToSimulate
             var inputDataJsonTxt = new CsvContent(inputData.ToCsvText());
 
             var inputData2 = new TimeSeriesDataSet();
-            inputData2.LoadFromCsv(inputDataJsonTxt);
+            var isOkData = inputData2.LoadFromCsv(inputDataJsonTxt);
+
+            Assert.IsTrue(isOkData,"uanble to load data from csv");
 
             // 3. deserialize to a new object
             var plantSim2 = PlantSimulatorSerializer.LoadFromJsonTxt(plantsimJsonTxt);
diff --git a/TimeSeriesAnalysis.csproj b/TimeSeriesAnalysis.csproj
index 5dbff76..4f8d940 100644
--- a/TimeSeriesAnalysis.csproj
+++ b/TimeSeriesAnalysis.csproj
@@ -14,7 +14,7 @@
 	<RunAnalyzersDuringLiveAnalysis>False</RunAnalyzersDuringLiveAnalysis>
     	<RepositoryUrl>https://github.com/equinor/TimeSeriesAnalysis.git</RepositoryUrl>
     	<PackageReadmeFile>readme.md</PackageReadmeFile>
-    	<Version>1.3.38</Version>
+    	<Version>1.3.39</Version>
     	<Company>Equinor</Company>
     	<Authors>Equinor</Authors>
     	<IncludeSymbols>true</IncludeSymbols>
diff --git a/TimeSeriesAnalysis/TimeSeriesDataSet.cs b/TimeSeriesAnalysis/TimeSeriesDataSet.cs
index 250483e..1e31165 100644
--- a/TimeSeriesAnalysis/TimeSeriesDataSet.cs
+++ b/TimeSeriesAnalysis/TimeSeriesDataSet.cs
@@ -225,12 +225,21 @@ public TimeSeriesDataSet Combine(TimeSeriesDataSet inputDataSet)
 
 
         /// <summary>
-        /// Fills a dataset with variables, values and dates 
+        /// Fills a dataset with variables, values and dates, removes "time" or "Time" from variableDict if present, and stores timestamps in internal dateTimes
         /// </summary>
         /// <param name="dateTimes"></param>
         /// <param name="variableDict"></param>
-        private void Fill(DateTime[] dateTimes, Dictionary<string, double[]> variableDict)
+        private bool Fill(DateTime[] dateTimes, Dictionary<string, double[]> variableDict)
         {
+            if (dateTimes == null)
+                return false;
+            if (variableDict == null)
+                return false;
+            if (variableDict.Keys == null)
+                return false;
+            if (variableDict.Keys.Count() == 0)
+                return false;
+
             if (variableDict.ContainsKey("Time"))
             {
                 variableDict.Remove("Time");
@@ -239,12 +248,22 @@ private void Fill(DateTime[] dateTimes, Dictionary<string, double[]> variableDic
             {
                 variableDict.Remove("time");
             }
+            N = variableDict[variableDict.Keys.First()].Length;
+            if (N == 0)
+            {
+                return false;
+            }
+            // load actual dataset
             dataset = variableDict;
-            N = dataset[dataset.Keys.First()].Length;
             if (dateTimes.Length > 1)
             {
                 timeStamps = dateTimes.ToList();
             }
+            else
+            {
+                return false;
+            }
+            return true;
         }
 
 
@@ -481,9 +500,9 @@ public void InitNewSignal(string signalName, double initalValue, int N, double n
                 out Dictionary<string, double[]> variableDict, dateTimeFormat);
             if (isOK)
             {
-                Fill(dateTimes, variableDict);
+                return Fill(dateTimes, variableDict);
             }
-            return isOK;
+            return false;
         }
 
 
@@ -546,9 +565,9 @@ public void CreateTimestamps(double timeBase_s, DateTime? t0 = null)
                 out Dictionary<string, double[]> variableDict, dateTimeFormat);
             if (isOk)
             {
-                Fill(dateTimes, variableDict);
+                return Fill(dateTimes, variableDict);
             }
-            return isOk;
+            return false;
         }
 
         /// <summary>