diff --git a/SourceCode/GPS/Forms/Field/FormFieldISOXML.cs b/SourceCode/GPS/Forms/Field/FormFieldISOXML.cs
index 89d837b49..1030aed71 100644
--- a/SourceCode/GPS/Forms/Field/FormFieldISOXML.cs
+++ b/SourceCode/GPS/Forms/Field/FormFieldISOXML.cs
@@ -119,7 +119,7 @@ private void FormFieldISOXML_Load(object sender, EventArgs e)
                         //First kind of Gudance  GGP\GPN\LSG\PNT
                         foreach (XmlNode nodePart in fieldParts)
                         {
-                            if (nodePart.Name == "GGP")
+                            if (nodePart.Name == "GGP" && nodePart.ChildNodes[0].Attributes.GetNamedItem("B") != null && nodePart.ChildNodes[0].Attributes.GetNamedItem("C") != null)
                             {
                                 //in GPN "B" is the name and "C" is the type
                                 if (nodePart.ChildNodes[0].Attributes["C"].Value == "1")
@@ -139,12 +139,13 @@ private void FormFieldISOXML_Load(object sender, EventArgs e)
                         foreach (XmlNode nodePart in fieldParts)
                         {
                             //LSG with a "5" in [A] means Guidance line [B] is the name of line
-                            if (nodePart.Name == "LSG" && nodePart.Attributes["A"].Value == "5")
+                            if (nodePart.Name == "LSG" && nodePart.ChildNodes[0].Attributes.GetNamedItem("A") != null && nodePart.Attributes["A"].Value == "5")
                             {
-                                if (nodePart.ChildNodes.Count < 3)
-                                    tree.Nodes[tree.Nodes.Count - 1].Nodes.Add("ABLine: " + nodePart.Attributes["B"].Value);
-                                else
-                                    tree.Nodes[tree.Nodes.Count - 1].Nodes.Add("Curve: " + nodePart.Attributes["B"].Value);
+                                if (nodePart.ChildNodes[0].Attributes.GetNamedItem("B") != null)
+	                                if (nodePart.ChildNodes.Count < 3)
+	                                    tree.Nodes[tree.Nodes.Count - 1].Nodes.Add("ABLine: " + nodePart.Attributes["B"].Value);
+	                                else
+	                                    tree.Nodes[tree.Nodes.Count - 1].Nodes.Add("Curve: " + nodePart.Attributes["B"].Value);
                             }
                         }
                     }
@@ -538,7 +539,10 @@ private void btnBuildFields_Click(object sender, EventArgs e)
                                 if (nodePart.ChildNodes[0].ChildNodes[0].Attributes["A"].Value == "5") //Guidance Pattern
                                 {
                                     //get the name
+                                    if (nodePart.ChildNodes[0].Attributes.GetNamedItem("B") != null)
                                     mf.ABLine.desName = nodePart.ChildNodes[0].Attributes["B"].Value;
+                                    else if(nodePart.ChildNodes[0].Attributes.GetNamedItem("A") != null)
+                                        mf.ABLine.desName = nodePart.Attributes["B"].Value; // fallback, if ChildNodes[0].Attributes["B"] is null
 
                                     double.TryParse(nodePart.ChildNodes[0].ChildNodes[0].ChildNodes[0].Attributes["C"].Value, NumberStyles.Float, CultureInfo.InvariantCulture, out latK);
                                     double.TryParse(nodePart.ChildNodes[0].ChildNodes[0].ChildNodes[0].Attributes["D"].Value, NumberStyles.Float, CultureInfo.InvariantCulture, out lonK);
@@ -587,7 +591,10 @@ private void btnBuildFields_Click(object sender, EventArgs e)
                                 if (nodePart.ChildNodes[0].ChildNodes[0].Attributes["A"].Value == "5") //Guidance Pattern
                                 {
                                     //get the name
-                                    mf.curve.desName = nodePart.ChildNodes[0].Attributes["B"].Value;
+                                    if (nodePart.ChildNodes[0].Attributes.GetNamedItem("B") != null)
+                                        mf.curve.desName = nodePart.ChildNodes[0].Attributes["B"].Value;
+                                    else if (nodePart.ChildNodes[0].Attributes.GetNamedItem("A") != null)
+                                        mf.curve.desName = nodePart.Attributes["B"].Value;  // fallback, if ChildNodes[0].Attributes["B"] is null
 
                                     double.TryParse(nodePart.ChildNodes[0].ChildNodes[0].ChildNodes[0].Attributes["C"].Value, NumberStyles.Float, CultureInfo.InvariantCulture, out latK);
                                     double.TryParse(nodePart.ChildNodes[0].ChildNodes[0].ChildNodes[0].Attributes["D"].Value, NumberStyles.Float, CultureInfo.InvariantCulture, out lonK);