diff --git a/src/CLIParser/CLIParser.cs b/src/CLIParser/CLIParser.cs
index 0262fe9..923bf81 100644
--- a/src/CLIParser/CLIParser.cs
+++ b/src/CLIParser/CLIParser.cs
@@ -76,19 +76,22 @@ public static string ToString(this IEnumerable<IArgumentMetadata> metadatas, str
         /// <returns>The string equivalent for command-line</returns>
         public static string ToString(this IArgumentMetadata metadata, params object[] values)
         {
-            if (metadata.Type != ArgumentType.Single && values == null || values.Length == 0) throw new ArgumentException("Cannot be null or empty", "values");
             string valueStr = string.Empty;
-            if (metadata.IsMultiValue)
+            if (metadata.Type != ArgumentType.Single)
             {
-                foreach (var item in values)
+                if (values == null || values.Length == 0) throw new ArgumentException("Cannot be null or empty", "values");
+                if (metadata.IsMultiValue)
                 {
-                    valueStr += $"{item}{metadata.MultiValueSeparator}";
+                    foreach (var item in values)
+                    {
+                        valueStr += $"{item}{metadata.MultiValueSeparator}";
+                    }
+                    valueStr = valueStr.Substring(0, valueStr.Length - 1);
+                }
+                else
+                {
+                    valueStr = values[0].ToString();
                 }
-                valueStr = valueStr.Substring(0, valueStr.Length - 1);
-            }
-            else
-            {
-                valueStr = values[0].ToString();
             }
 
             var prefix = metadata.PrefixInUse;
diff --git a/src/CLIParser/CLIParser.csproj b/src/CLIParser/CLIParser.csproj
index 7918460..6d337fa 100644
--- a/src/CLIParser/CLIParser.csproj
+++ b/src/CLIParser/CLIParser.csproj
@@ -8,7 +8,7 @@
 		<Owners>MASES s.r.l.</Owners>
 		<Authors>MASES s.r.l.</Authors>
 		<Company>MASES s.r.l.</Company>
-		<Version>3.1.1.0</Version>
+		<Version>3.1.2.0</Version>
 		<Product>CLIParser</Product>
 		<GenerateAssemblyInfo>true</GenerateAssemblyInfo>
 		<TargetFrameworks>netstandard2.0</TargetFrameworks>
diff --git a/tests/CLIParserTest/CLIParserTest.csproj b/tests/CLIParserTest/CLIParserTest.csproj
index 85e4298..0220ebc 100644
--- a/tests/CLIParserTest/CLIParserTest.csproj
+++ b/tests/CLIParserTest/CLIParserTest.csproj
@@ -9,7 +9,7 @@
     <Copyright>Copyright ©  MASES s.r.l. 2022</Copyright>
     <Authors>MASES s.r.l.</Authors>
     <Company>MASES s.r.l.</Company>
-    <Version>3.1.1.0</Version>
+    <Version>3.1.2.0</Version>
     <TargetFrameworks>net461;netcoreapp3.1;net5.0;net6.0</TargetFrameworks>
     <OutputPath>..\..\bin\</OutputPath>
   </PropertyGroup>
diff --git a/tests/CLIParserTest/Program.cs b/tests/CLIParserTest/Program.cs
index 63fa378..ed4f438 100644
--- a/tests/CLIParserTest/Program.cs
+++ b/tests/CLIParserTest/Program.cs
@@ -102,6 +102,9 @@ static void Main(string[] args)
 
                 var result = parser.Parse(args);
 
+                var resultToString = parser.Arguments.ToString("MyParam2", "TEST");
+                resultToString = parser.Arguments.ToString("myval");
+
                 var fileInfo = parser.FromFile(result);
 
                 parser.Override(result, fileInfo);