diff --git a/EDSEditorGUI/Form1.cs b/EDSEditorGUI/Form1.cs
index 1e9d0ca..0c1b10c 100644
--- a/EDSEditorGUI/Form1.cs
+++ b/EDSEditorGUI/Form1.cs
@@ -27,6 +27,7 @@ You should have received a copy of the GNU General Public License
 using System.IO;
 using libEDSsharp;
 using static System.Windows.Forms.VisualStyles.VisualStyleElement;
+using System.Diagnostics;
 
 namespace ODEditor
 {
@@ -1038,7 +1039,14 @@ private void documentationToolStripMenuItem_Click(object sender, EventArgs e)
                     docgenMarkup.genmddoc(temp2, dv.eds);
                     if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                     {
-                        System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo("cmd", $"/c start {temp2}"));
+                        // By using "cmd /c start" you avoid the child process to be attached to the current
+                        // process so the report viewer does not close when leaving the EDS editor.
+                        // {temp2} is quoted too, so spaces in the path do not cause problems.
+                        Process.Start(new ProcessStartInfo {
+                            FileName = "cmd",
+                            Arguments = $"/c start \"\" \"{temp2}\"",
+                            WindowStyle= ProcessWindowStyle.Hidden
+                        });
                     }
                     if (IsRunningOnMono())
                     {
diff --git a/EDSEditorGUI/style.css b/EDSEditorGUI/style.css
index 934abd0..73c6e99 100644
--- a/EDSEditorGUI/style.css
+++ b/EDSEditorGUI/style.css
@@ -111,4 +111,9 @@ table tr:hover td {
 .receivers 
 {
 width: 90%;
-}
\ No newline at end of file
+}
+
+.error
+{
+	color: red;
+}
diff --git a/libEDSsharp/NetworkPDOreport.cs b/libEDSsharp/NetworkPDOreport.cs
index d610834..998d1c8 100644
--- a/libEDSsharp/NetworkPDOreport.cs
+++ b/libEDSsharp/NetworkPDOreport.cs
@@ -179,7 +179,15 @@ public void gennetpdodoc(string filepath, List<EDSsharp> network)
                                 }
                                 else
                                 {
-                                    name = eds.ods[index].Getsubobject(subindex).parameter_name;
+                                    ODentry current_sdo = eds.ods[index].Getsubobject(subindex);
+                                    if (current_sdo != null)
+                                    {
+                                        name = current_sdo.parameter_name;
+                                    }
+                                    else
+                                    {
+                                        name = string.Format("<p class=\"error\">Error: subindex is missing in SDO!</p>");
+                                    }
                                 }