While swapping a node, log4net:ERROR Exception while rendering object of type is printed on SDKD console

When swapping a node following error is printed on SDKD console.

log4net:ERROR Exception while rendering object of type [Common.Logging.Factory.AbstractLogger+StringFormatFormattedMessage]
System.FormatException: Input string was not in a correct format.
   at System.Text.StringBuilder.AppendFormatHelper(IFormatProvider provider, String format, ParamsArray args)
   at System.String.FormatHelper(IFormatProvider provider, String format, ParamsArray args)
   at System.String.Format(IFormatProvider provider, String format, Object[] args)
   at Common.Logging.Factory.AbstractLogger.StringFormatFormattedMessage.ToString() in c:_oss\common-logging\src\Common.Logging.Portable\Logging\Factory\AbstractLogger.cs:line 125
   at log4net.ObjectRenderer.DefaultRenderer.RenderObject(RendererMap rendererMap, Object obj, TextWriter writer)
   at log4net.ObjectRenderer.RendererMap.FindAndRender(Object obj, TextWriter writer)

It turned out following line from CouchbaseRequestExecuter.cs causes it.

Log.Debug(JsonConvert.SerializeObject(bucketConfig));

Looks like Log.Debug() does not like a string converted from Json object.

By the way, this does not affect functionality.