diff --git a/BearMLLib/BearMLLib.csproj b/BearMLLib/BearMLLib.csproj
index 408d551..e9ab135 100644
--- a/BearMLLib/BearMLLib.csproj
+++ b/BearMLLib/BearMLLib.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.1</TargetFramework>
-    <Version>3.1.4</Version>
+    <Version>3.1.5</Version>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Authors>Bear</Authors>
     <Company>Bear Office</Company>
diff --git a/BearMLLib/Core/Reader.cs b/BearMLLib/Core/Reader.cs
index 6cc3f71..4700ce9 100644
--- a/BearMLLib/Core/Reader.cs
+++ b/BearMLLib/Core/Reader.cs
@@ -39,7 +39,7 @@ internal ConfigsContainer GenerateConfigs()
             var container = new ConfigsContainer();
             var startPos = 0;
 
-            if (LineAnalyzer.IsGroupLine(_raw[startPos]))
+            if (_raw.Count == 0 || LineAnalyzer.IsGroupLine(_raw[startPos]))
             {
                 // create empty default group at start.
                 var defaultGroup = GroupParser.ParseFromRaw(new ReferList<string>(new string[0]), true, out _);
diff --git a/BearMLLib/Serialization/ObjectSerializer.cs b/BearMLLib/Serialization/ObjectSerializer.cs
index 6421e1b..2fb91f9 100644
--- a/BearMLLib/Serialization/ObjectSerializer.cs
+++ b/BearMLLib/Serialization/ObjectSerializer.cs
@@ -31,7 +31,7 @@ internal static object Deserialize(KeyContentPair[] pairs, Type targetType, ICon
 
             foreach (var prop in targetType.GetProperties())
             {
-                if (HasIgnoreAttribute(prop)) continue;
+                if (HasIgnoreAttribute(prop) || prop.GetIndexParameters().Length != 0) continue;
 
                 var name = prop.Name;
                 var type = prop.PropertyType;
@@ -79,12 +79,12 @@ internal static KeyContentPair[] Serialize(object source, Type sourceType, IConv
                 pairs.Add(new KeyContentPair(new Key(key, null, null), content));
             }
 
-            foreach (var property in sourceType.GetProperties())
+            foreach (var prop in sourceType.GetProperties())
             {
-                if (HasIgnoreAttribute(property)) continue;
+                if (HasIgnoreAttribute(prop) || prop.GetIndexParameters().Length != 0) continue;
 
-                var key = property.Name;
-                var content = ContentTypeSelector.GetContent(property.GetValue(source), providers);
+                var key = prop.Name;
+                var content = ContentTypeSelector.GetContent(prop.GetValue(source), providers);
                 pairs.Add(new KeyContentPair(new Key(key, null, null), content));
             }
 
diff --git a/BearMLLib/Text/TextProcesser.cs b/BearMLLib/Text/TextProcesser.cs
index 02f7854..372c1bc 100644
--- a/BearMLLib/Text/TextProcesser.cs
+++ b/BearMLLib/Text/TextProcesser.cs
@@ -84,33 +84,33 @@ internal static string TrimStartAndEnd(this string input)
             return input.TrimStart().TrimEnd();
         }
 
-        internal static bool StartsWith(this string input, char value, bool ignorewhitespace)
+        internal static bool StartsWith(this string input, char value, bool ignoreWhiteSpace)
         {
-            if (ignorewhitespace)
+            if (ignoreWhiteSpace)
                 return input.TrimStart().StartsWith(value);
             else
                 return input.StartsWith(value);
         }
 
-        internal static bool StartsWith(this string input, string value, bool ignorewhitespace)
+        internal static bool StartsWith(this string input, string value, bool ignoreWhiteSpace)
         {
-            if (ignorewhitespace)
+            if (ignoreWhiteSpace)
                 return input.TrimStart().StartsWith(value);
             else
                 return input.StartsWith(value);
         }
 
-        internal static bool EndsWith(this string input, char value, bool ignorewhitespace)
+        internal static bool EndsWith(this string input, char value, bool ignoreWhiteSpace)
         {
-            if (ignorewhitespace)
+            if (ignoreWhiteSpace)
                 return input.TrimEnd().EndsWith(value);
             else
                 return input.EndsWith(value);
         }
 
-        internal static bool EndsWith(this string input, string value, bool ignorewhitespace)
+        internal static bool EndsWith(this string input, string value, bool ignoreWhiteSpace)
         {
-            if (ignorewhitespace)
+            if (ignoreWhiteSpace)
                 return input.TrimEnd().EndsWith(value);
             else
                 return input.EndsWith(value);
@@ -192,7 +192,7 @@ internal static string Escape(this string input, EscapeLevel level)
 
                         i++;
 
-                        var lastpos = i;
+                        var lastPos = i;
                         while (i < input.Length)
                         {
                             ch = input[i];
@@ -200,7 +200,7 @@ internal static string Escape(this string input, EscapeLevel level)
 
                             i++;
                         }
-                        sb.Append(input, lastpos, i - lastpos);
+                        sb.Append(input, lastPos, i - lastPos);
 
                     } while (i < input.Length);
 
@@ -240,12 +240,12 @@ internal static string Unescape(this string input)
                             i++;
                         }
 
-                        var lastpos = i;
+                        var lastPos = i;
                         while (i < input.Length && input[i] != '\\')
                         {
                             i++;
                         }
-                        sb.Append(input, lastpos, i - lastpos);
+                        sb.Append(input, lastPos, i - lastPos);
 
                     } while (i < input.Length);