diff --git a/LibNoDaveConnectionLibrary/DataTypes/Projectfolders/Step7V5/BlocksOfflineFolder.cs b/LibNoDaveConnectionLibrary/DataTypes/Projectfolders/Step7V5/BlocksOfflineFolder.cs
index 063dafa2..c74c0d4b 100644
--- a/LibNoDaveConnectionLibrary/DataTypes/Projectfolders/Step7V5/BlocksOfflineFolder.cs
+++ b/LibNoDaveConnectionLibrary/DataTypes/Projectfolders/Step7V5/BlocksOfflineFolder.cs
@@ -641,7 +641,7 @@ public Block GetBlock(ProjectBlockInfo blkInfo, S7ConvertingOptions myConvOpt)
                         retVal.Parameter = Parameter.GetInterfaceOrDBFromStep7ProjectString(myTmpBlk.blkinterface, ref ParaList, blkInfo.BlockType, false, this, retVal, myConvOpt);
                     }
                 
-                    if (myTmpBlk.blockdescription != null)
+                    if (myTmpBlk.blockdescription != null && myTmpBlk.blockdescription.Length > 3)
                     {
                         retVal.Title = Project.ProjectEncoding.GetString(myTmpBlk.blockdescription, 3, myTmpBlk.blockdescription[1] - 4);
                         retVal.Description = Project.ProjectEncoding.GetString(myTmpBlk.blockdescription, myTmpBlk.blockdescription[1], myTmpBlk.blockdescription.Length - myTmpBlk.blockdescription[1] - 1).Replace("\n", Environment.NewLine);
diff --git a/LibNoDaveConnectionLibrary/PLCs/S7_xxx/MC7/Helper.cs b/LibNoDaveConnectionLibrary/PLCs/S7_xxx/MC7/Helper.cs
index 88cd45d4..000e10c0 100644
--- a/LibNoDaveConnectionLibrary/PLCs/S7_xxx/MC7/Helper.cs
+++ b/LibNoDaveConnectionLibrary/PLCs/S7_xxx/MC7/Helper.cs
@@ -410,7 +410,7 @@ static public int GetIntFromHexString(string myString)
         static public uint GetUIntFromHexString(string myString)
         {
             uint val = 0;
-            foreach (char tmp in myString.ToLower().Replace("dw#16#", "").Replace("w#16#", "").Replace("b#16#", "").Replace("\t", ""))
+            foreach (char tmp in myString.ToLower().Replace("//", "").Replace("dw#16#", "").Replace("w#16#", "").Replace("b#16#", "").Replace("\t", "").Trim())
             {
                 val *= 16;
                 switch (tmp)
diff --git a/LibNoDaveConnectionLibrary/PLCs/S7_xxx/MC7/JumpMarks.cs b/LibNoDaveConnectionLibrary/PLCs/S7_xxx/MC7/JumpMarks.cs
index b15969cb..1c0e2c33 100644
--- a/LibNoDaveConnectionLibrary/PLCs/S7_xxx/MC7/JumpMarks.cs
+++ b/LibNoDaveConnectionLibrary/PLCs/S7_xxx/MC7/JumpMarks.cs
@@ -52,7 +52,9 @@ public static List<FunctionBlockRow> AddJumpmarks(List<FunctionBlockRow> myBlk,
 
             if (JumpMarks != null && JumpMarks.Length >= 5)
             {
-                int anzJ = BitConverter.ToInt16(JumpMarks, NetworkCount * 2);  //Todo: find out why it does not always contain the right amount of JumpNames
+                // Comment this out, as the variable anzJ is not used at all and it sometimes throws and IndexOutOfBounds Exception
+                // Eg. there are 68 jump marks, but the Network count is 40 => access from index 80 --> IOB Exception
+                // int anzJ = BitConverter.ToInt16(JumpMarks, NetworkCount * 2);  //Todo: find out why it does not always contain the right amount of JumpNames
 
                 for (int n = NetworkCount * 2 + 4; n < JumpMarks.Length; n += 5)
                 {
diff --git a/LibNoDaveConnectionLibrary/Projectfiles/Step7ProjectV5.cs b/LibNoDaveConnectionLibrary/Projectfiles/Step7ProjectV5.cs
index 2fb0c67f..7ee6e46c 100644
--- a/LibNoDaveConnectionLibrary/Projectfiles/Step7ProjectV5.cs
+++ b/LibNoDaveConnectionLibrary/Projectfiles/Step7ProjectV5.cs
@@ -1579,7 +1579,11 @@ override protected void LoadProject()
                 foreach (var cp in CPFolders.Where(x => x.SubModul != null))
                 {
                     if (cp.NetworkInterfaces == null) cp.NetworkInterfaces = new List<NetworkInterface>();
-                    cp.NetworkInterfaces.AddRange(cp.SubModul.NetworkInterfaces);
+
+                    if (cp.SubModul.NetworkInterfaces != null)
+                    {
+                        cp.NetworkInterfaces.AddRange(cp.SubModul.NetworkInterfaces);
+                    }
                     CPFolders.Remove(cp.SubModul);
                     cp.SubModul = null;
                     repeat = true;