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I've been keeping prisoners in a room to train my doctors and two of them eventually fell in love and tried to get married.  I got the "so and so are getting married, the colonists are going to celebrate" message but nothing actually happened so I ignored it.  Eventually they tried to escape and both ended up getting killed (the guy by infection and the girl by going berserk and my brawler hitting her on the head too hard). 

The next time I tried to load a save I got "Error while loading a map.  See error log for details"

I go there and I see this:

Exception from asynchronous event: System.NullReferenceException: Object reference not set to an instance of an object

  at RimWorld.LordJob_Joinable_MarriageCeremony.CreateGraph () [0x00000] in <filename unknown>:0

This is what clued me in to what was wrong.  So I checked the save file and I found this (in quotes).  I'm pretty sure that's what it was because I removed it from the save and that fixed it

<li>
               <loadID>413</loadID>
               <faction>Faction_4</faction>
               <ownedPawns />
               <avoidGrid IsNull="True" />
               <lordJob Class="LordJob_Joinable_MarriageCeremony">
                  <firstPawn>null</firstPawn>
                  <secondPawn>null</secondPawn>
                  <spot>(130, 0, 224)</spot>
               </lordJob>
               <ticksInToil>1319162</ticksInToil>
               <initialColonyHealthTotal>860193</initialColonyHealthTotal>
               <extraForbiddenThings />
               <lordToilData>
                  <keys>
                     <li>1</li>
                  </keys>
                  <values>
                     <li Class="LordToilData_MarriageCeremony">
                        <spectateRectAllowedSides>All</spectateRectAllowedSides>
                     </li>
                  </values>
               </lordToilData>
               <triggerData>
                  <keys>
                     <li>4</li>
                  </keys>
                  <values>
                     <li Class="Verse.AI.Group.TriggerData_TicksPassed" />
                  </values>
               </triggerData>
               <curLordToilIdx>0</curLordToilIdx>
            </li>

Let me know if you need a save