JamesNK/Newtonsoft.Json · error · JsonSerializationException

Error getting value from '{0}' on '{1}'.

Error message

Error getting value from '{0}' on '{1}'.

What it means

Identical to error 221 but from ExpressionValueProvider.GetValue on platforms where the expression-tree provider is active. Wraps the original getter exception as InnerException; '{0}' is the member name, '{1}' the target type.

Source

Thrown at Src/Newtonsoft.Json/Serialization/ExpressionValueProvider.cs:110

        /// <summary>
        /// Gets the value.
        /// </summary>
        /// <param name="target">The target to get the value from.</param>
        /// <returns>The value.</returns>
        public object? GetValue(object target)
        {
            try
            {
                if (_getter == null)
                {
                    _getter = ExpressionReflectionDelegateFactory.Instance.CreateGet<object>(_memberInfo);
                }

                return _getter(target);
            }
            catch (Exception ex)
            {
                throw new JsonSerializationException("Error getting value from '{0}' on '{1}'.".FormatWith(CultureInfo.InvariantCulture, _memberInfo.Name, target.GetType()), ex);
            }
        }
    }
}

#endif

View on GitHub (pinned to 4f73e74372)

Solutions

1. Read InnerException for the true getter error.
2. Add a null/state guard inside the getter or use ShouldSerializeX to skip it.
3. Decorate the problematic property with [JsonIgnore].
4. Configure JsonSerializerSettings.Error handler to continue past the failing member.

Example fix

// before
public class Entity { public string Name => _lazy.Value.Name; }
JsonConvert.Serialize(entity); // _lazy throws
// after
public class Entity {
    public bool ShouldSerializeName() => _lazy.IsValueCreated;
    public string Name => _lazy.Value.Name;
}

public bool ShouldSerializeX() => _lazy != null && _lazy.IsValueCreated;

try { JsonConvert.SerializeObject(obj); }
catch (JsonSerializationException ex) when (ex.Message.Contains("Error getting value")) {
    logger.Error(ex.InnerException, "getter failed at {Path}", ex.Path); throw;
}

When it happens

Trigger: A property getter throws while serializing, surfaced through the expression-based value provider. Same conditions as 221 but on .NET Core/.NET 5+ runtimes.

Common situations: EF/Linq2Sql proxy properties throwing after context disposal, computed properties throwing on null state, porting code from .NET Framework where DynamicValueProvider was used and now ExpressionValueProvider surfaces the failure.

Related errors

• Error getting value from '{0}' on '{1}'.
• Error setting value to '{0}' on '{1}'.
• Error getting value from '{0}' on '{1}'.
• Error setting value to '{0}' on '{1}'.
• Could not create getter for {0}. ByRef return values are not

AI-assisted analysis of JamesNK/Newtonsoft.Json@4f73e74372 (2026-08-07). Data as JSON: /api/errors/11a9b7de24dcca7e. Report an issue: GitHub.