Merge pull request #77 from vanjoge/master

Fix bug with null parameter

Author: Taritsyn

src/JavaScriptEngineSwitcher.ChakraCore/Helpers/ReflectionHelpers.cs

@@ -59,6 +59,7 @@ public static void FixFieldValueType(ref object value, FieldInfo field)
 
 		public static void FixPropertyValueType(ref object value, PropertyInfo property)
 		{
+			if (value == null) return;
 			Type valueType = value.GetType();
 			Type propertyType = property.PropertyType;
 
@@ -80,6 +81,7 @@ public static void FixArgumentTypes(ref object[] argValues, ParameterInfo[] para
 			for (int argIndex = 0; argIndex < argCount; argIndex++)
 			{
 				object argValue = argValues[argIndex];
+				if (argValue == null) continue;
 				Type argType = argValue.GetType();
 
 				ParameterInfo parameter = parameters[argIndex];
@@ -122,7 +124,17 @@ public static MethodBase GetBestFitMethod(MethodBase[] methods, object[] argValu
 			}
 
 			Type[] argTypes = argValues
-				.Select(a => a.GetType())
+				.Select(a =>
+				{
+					if (a == null)
+					{
+						return null;
+					}
+					else
+					{
+						return a.GetType();
+					}
+				})
 				.ToArray()
 				;
 			var compatibleMethods = new List<MethodWithMetadata>();
@@ -222,4 +234,4 @@ public ushort CompatibilityScore
 			}
 		}
 	}
-}
+}