diff --git a/TiaCodegen/CodeGen/KopCodeHelper.cs b/TiaCodegen/CodeGen/KopCodeHelper.cs
index e8c2d46..2957ae6 100644
--- a/TiaCodegen/CodeGen/KopCodeHelper.cs
+++ b/TiaCodegen/CodeGen/KopCodeHelper.cs
@@ -516,7 +516,7 @@ private void AddWires(IOperationOrSignal op)
                             }
                             else
                             {
-                                _sb.AppendLine("<NameCon UId=\"" + sng.Children.Last().OperationId + "\" Name=\"out\" />");
+                                _sb.AppendLine("<NameCon UId=\"" + (sng.Children.Any() ? sng.Children.Last().OperationId : sng.OperationId) + "\" Name=\"out\" />");
                             }
                         }
                         _sb.AppendLine("<NameCon UId=\"" + op.OperationId + "\" Name=\"" + intf.Key + "\" />");
@@ -527,7 +527,7 @@ private void AddWires(IOperationOrSignal op)
                     {
                         _sb.AppendLine("<Wire UId=\"" + _currentId + "\">" + (debug ?? ("<!-- Wire 3 FunctionCall -->")));
                         _sb.AppendLine("<NameCon UId=\"" + op.OperationId + "\" Name=\"eno\" />");
-                        _sb.AppendLine("<NameCon UId=\"" + sng.Children.Last().OperationId + "\" Name=\"in\" />");
+                        _sb.AppendLine("<NameCon UId=\"" + (sng.Children.Any() ? sng.Children.Last().OperationId : sng.OperationId) + "\" Name=\"in\" />");
                         _sb.AppendLine("</Wire>");
                         _currentId++;
                     }
@@ -781,7 +781,7 @@ void ImportChildOrs (Or childOr)
                     if (op.Children[1] is Signal)
                         ch = op.Children[1];
                     else
-                        ch = op.Children[1].Children.Last();
+                        ch = op.Children[1].Children.Any() ? op.Children[1].Children.Last() : op.Children[1];
 
                     if (op.Children[1] is Or || op.Children[1] is CompareOperator || op.Children[1] is Move || op.Children[1] is Convert || op.Children[1] is S_Move || op.Children[1] is ICoil)
                     {
diff --git a/TiaCodegen/Commands/BaseOperationOrSignal.cs b/TiaCodegen/Commands/BaseOperationOrSignal.cs
index 5075b79..5a8b48d 100644
--- a/TiaCodegen/Commands/BaseOperationOrSignal.cs
+++ b/TiaCodegen/Commands/BaseOperationOrSignal.cs
@@ -59,7 +59,7 @@ public override string ToString()
 
         public IOperationOrSignal GetFirstChildNotAnd()
         {
-            if (this is And)
+            if (this is And && Children.Count > 0)
             {
                 var ch1 = ((And)this).Children[0];
                 if (ch1 is BaseOperationOrSignal)
diff --git a/TiaCodegen/Commands/Functions/Arithmetic/AddCall.cs b/TiaCodegen/Commands/Functions/Arithmetic/AddCall.cs
index 101e686..b56d6f6 100644
--- a/TiaCodegen/Commands/Functions/Arithmetic/AddCall.cs
+++ b/TiaCodegen/Commands/Functions/Arithmetic/AddCall.cs
@@ -4,9 +4,9 @@
 
 namespace TiaCodegen.Commands.Functions.Arithmetic
 {
-    public class MulCall : VariableArithmeticCall
+    public class AddCall : VariableArithmeticCall
     {
-        public MulCall(string type,
+        public AddCall(string type,
             IOperationOrSignal in1,
             IOperationOrSignal in2,
             IOperationOrSignal in3 = null,
@@ -58,7 +58,7 @@ public MulCall(string type,
             IOperationOrSignal in49 = null,
             IOperationOrSignal in50 = null,
             IOperationOrSignal out1 = null,
-            IOperationOrSignal eno = null) : base("Mul", eno)
+            IOperationOrSignal eno = null) : base("Add", eno)
         {
             DisableEno = true;
             Type = type;
diff --git a/TiaCodegen/Commands/Functions/Arithmetic/MulCall.cs b/TiaCodegen/Commands/Functions/Arithmetic/MulCall.cs
index b56d6f6..101e686 100644
--- a/TiaCodegen/Commands/Functions/Arithmetic/MulCall.cs
+++ b/TiaCodegen/Commands/Functions/Arithmetic/MulCall.cs
@@ -4,9 +4,9 @@
 
 namespace TiaCodegen.Commands.Functions.Arithmetic
 {
-    public class AddCall : VariableArithmeticCall
+    public class MulCall : VariableArithmeticCall
     {
-        public AddCall(string type,
+        public MulCall(string type,
             IOperationOrSignal in1,
             IOperationOrSignal in2,
             IOperationOrSignal in3 = null,
@@ -58,7 +58,7 @@ public AddCall(string type,
             IOperationOrSignal in49 = null,
             IOperationOrSignal in50 = null,
             IOperationOrSignal out1 = null,
-            IOperationOrSignal eno = null) : base("Add", eno)
+            IOperationOrSignal eno = null) : base("Mul", eno)
         {
             DisableEno = true;
             Type = type;
diff --git a/TiaCodegen/Commands/Move.cs b/TiaCodegen/Commands/Move.cs
index e18eed4..cb0c8e8 100644
--- a/TiaCodegen/Commands/Move.cs
+++ b/TiaCodegen/Commands/Move.cs
@@ -9,6 +9,6 @@ public Move(params IOperationOrSignal[] operationOrSignals)
             : base(operationOrSignals)
         { }
 
-        public override int Cardinality { get { return Children.Count() - 1; } }
+        public override int Cardinality { get { return Children.Any() ? Children.Count() - 1 : 0; } }
     }
 }
diff --git a/TiaCodegen/Commands/Signals/Signal.cs b/TiaCodegen/Commands/Signals/Signal.cs
index 159462e..9594d1c 100644
--- a/TiaCodegen/Commands/Signals/Signal.cs
+++ b/TiaCodegen/Commands/Signals/Signal.cs
@@ -192,9 +192,10 @@ public void AddXmlToStringBuilder(ulong id, StringBuilder sb)
             {
                 sb.AppendLine("<Access Scope=\"GlobalVariable\" UId=\"" + id + "\">" + "  <!-- P1: " + Name + " -->");
                 sb.AppendLine("<Symbol>");
-                for (int i = 0; i < Escape(Name).Split('.').Length; i++) // Aufsplitten von a.b.c in einzel Elemente
+                var nameParts = Escape(Name).Split('.');
+                for (int i = 0; i < nameParts.Length; i++) // Aufsplitten von a.b.c in einzel Elemente
                 {
-                    var part = Unescape(Escape(Name).Split('.')[i]);
+                    var part = Unescape(nameParts[i]);
 
                     var idx = part.IndexOf("[") + 1; // Aufsplitten von Arrays
                     if (idx > 0)
@@ -213,7 +214,7 @@ public void AddXmlToStringBuilder(ulong id, StringBuilder sb)
                         {
                             var p1 = part.Substring(idx, part.Length - idx);
                             var accessType = "GlobalVariable";
-                            if (p1[0] == '#')
+                            if (p1.Length > 0 && p1[0] == '#')
                             {
                                 p1 = p1.Substring(1);
                                 accessType = "LocalVariable";
@@ -224,7 +225,9 @@ public void AddXmlToStringBuilder(ulong id, StringBuilder sb)
                             while (p1 != null)
                             {
                                 i++;
-                                p1 = Unescape(Escape(Name).Split('.')[i]);
+                                if (i >= nameParts.Length)
+                                    break;
+                                p1 = Unescape(nameParts[i]);
                                 if (p1.Contains("]"))
                                 {
                                     sb.AppendLine("<Component Name=\"" + p1.Substring(0, p1.Length - 1) + "\" />");
@@ -328,12 +331,13 @@ public void AddXmlToStringBuilder(ulong id, StringBuilder sb)
                     sb.AppendLine("<Access Scope=\"GlobalVariable\" UId=\"" + id + "\">" + "  <!-- P3: " + Name + " -->");
                 }
                 sb.AppendLine("<Symbol>");
-                var cnt = Escape(LocalName).Split('.').Length;
+                var localNameParts = Escape(LocalName).Split('.');
+                var cnt = localNameParts.Length;
                 if (this is FixedSignal)
                     cnt = 1;
                 for (int i = 0; i < cnt; i++) // Aufsplitten von a.b.c in einzel Elemente
                 {
-                    var part = Unescape(Escape(LocalName).Split('.')[i]);
+                    var part = Unescape(localNameParts[i]);
                     if (this is FixedSignal)
                         part = LocalName;
 
@@ -354,7 +358,7 @@ public void AddXmlToStringBuilder(ulong id, StringBuilder sb)
                         {
                             var p1 = part.Substring(idx, part.Length - idx);
                             var accessType = "GlobalVariable";
-                            if (p1[0] == '#')
+                            if (p1.Length > 0 && p1[0] == '#')
                             {
                                 p1 = p1.Substring(1);
                                 accessType = "LocalVariable";
@@ -366,7 +370,9 @@ public void AddXmlToStringBuilder(ulong id, StringBuilder sb)
                             while (p1 != null)
                             {
                                 i++;
-                                p1 = Unescape(Escape(LocalName).Split('.')[i]);
+                                if (i >= localNameParts.Length)
+                                    break;
+                                p1 = Unescape(localNameParts[i]);
                                 if (p1.Contains(","))
                                 {
                                     var innerParts = p1.Split(',');
@@ -397,7 +403,7 @@ public void AddXmlToStringBuilder(ulong id, StringBuilder sb)
                                             sb.AppendLine("</Access>");
 
                                             var accessTypePne = "GlobalVariable";
-                                            if (pNe[0] == '#')
+                                            if (pNe.Length > 0 && pNe[0] == '#')
                                             {
                                                 pNe = pNe.Substring(1);
                                                 accessTypePne = "LocalVariable";