c# 7 features are breaking things

Source/MonoGame.Extended.Tweening/TweenFieldMember.cs

@@ -19,7 +19,7 @@ namespace MonoGame.Extended.Tweening
         private static Func<object, object> CompileGetMethod(FieldInfo fieldInfo)
         {
             var self = Expression.Parameter(typeof(object));
-            var instance = Expression.Convert(self, fieldInfo.DeclaringType ?? throw new InvalidOperationException());
+            var instance = Expression.Convert(self, fieldInfo.DeclaringType);
             var field = Expression.Field(instance, fieldInfo);
             var convert = Expression.TypeAs(field, typeof(object));
 

Source/MonoGame.Extended.Tweening/TweenMember.cs

@@ -44,8 +44,8 @@ namespace MonoGame.Extended.Tweening
 
         public T Value
         {
-            get => (T)_getMethod(Target);
-            set => _setMethod(Target, value);
+            get { return (T) _getMethod(Target); }
+            set { _setMethod(Target, value); }
         }
     }
 }

Source/MonoGame.Extended.Tweening/TweenPropertyMember.cs

@@ -22,7 +22,7 @@ namespace MonoGame.Extended.Tweening
         private static Func<object, object> CompileGetMethod(PropertyInfo propertyInfo)
         {
             var param = Expression.Parameter(typeof(object));
-            var instance = Expression.Convert(param, propertyInfo.DeclaringType ?? throw new InvalidOperationException());
+            var instance = Expression.Convert(param, propertyInfo.DeclaringType);
             var convert = Expression.TypeAs(Expression.Property(instance, propertyInfo), typeof(object));
             return Expression.Lambda<Func<object, object>>(convert, param).Compile();
         }