XML RimWorld.StatDef defines the same field twice: parts.

Field contents: 1.11.0510.970.920.850.80.8.

Whole XML:

<StatDef><defName>RangedWeapon_Cooldown</defName><label>ranged cooldown</label><description>How long it takes to recover after firing this weapon.</description><category>Weapon_Ranged</category><defaultBaseValue>1</defaultBaseValue><minValue>0.01</minValue><toStringStyle>FloatTwo</toStringStyle><formatString>{0} s</formatString><showIfUndefined>false</showIfUndefined><displayPriorityInCategory>5106</displayPriorityInCategory><scenarioRandomizable>true</scenarioRandomizable><parts><li Class="VFECore.Misc.StatPart_Ammo" /><li Class="VFESecurity.StatPart_AmmoCrate"><valueFactor>0.8</valueFactor></li></parts><parts><li Class="StatPart_Quality"><factorAwful>1.1</factorAwful><factorPoor>1.05</factorPoor><factorNormal>1</factorNormal><factorGood>0.97</factorGood><factorExcellent>0.92</factorExcellent><factorMasterwork>0.85</factorMasterwork><factorLegendary>0.8</factorLegendary></li><li Class="VFESecurity.StatPart_AmmoCrate"><valueFactor>0.8</valueFactor></li></parts></StatDef>
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch4 (string)
Verse.DirectXmlToObject:ObjectFromXml<RimWorld.StatDef> (System.Xml.XmlNode,bool)
Verse.DirectXmlToObject:ObjectFromXmlReflection<RimWorld.StatDef> (System.Xml.XmlNode,bool)
(wrapper dynamic-method) Verse.DirectXmlLoader:Verse.DirectXmlLoader.DefFromNode_Patch3 (System.Xml.XmlNode,Verse.LoadableXmlAsset)
(wrapper dynamic-method) Verse.LoadedModManager:Verse.LoadedModManager.ParseAndProcessXML_Patch3 (System.Xml.XmlDocument,System.Collections.Generic.Dictionary`2<System.Xml.XmlNode, Verse.LoadableXmlAsset>)
Verse.LoadedModManager:LoadAllActiveMods ()
Verse.PlayDataLoader:DoPlayLoad ()
Verse.PlayDataLoader:LoadAllPlayData (bool)
Verse.Root/<>c:<Start>b__6_1 ()
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__27_0 ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()