Error when regenerating terrain

[vedrit]

12.5.2024 16:35:43 [Worldgen] An error was thrown in pass Terrain when generating chunk column X=16005,Z=15993 in world 'Dark Village World' with seed 751042106
Exception System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)
 ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at NewGenTerra.<>c__DisplayClass49_0.<Generate>b__1(Int32 chunkIndex2d) in D:\Rivers\Rivers\src\WorldGenSystems\NewGenTerra.cs:line 661
   at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`1.<ForWorker>b__1(RangeWorker& currentWorker, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`1.<ForWorker>b__1(RangeWorker& currentWorker, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
   at System.Threading.Tasks.TaskReplicator.Replica.Execute()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.TaskReplicator.Run[TState](ReplicatableUserAction`1 action, ParallelOptions options, Boolean stopOnFirstFailure)
   at System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
   at System.Threading.Tasks.Parallel.For(Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action`1 body)
   at NewGenTerra.Generate(IServerChunk[] chunks, Int32 chunkX, Int32 chunkZ, Boolean requiresChunkBorderSmoothing) in D:\Rivers\Rivers\src\WorldGenSystems\NewGenTerra.cs:line 485
   at NewGenTerra.OnChunkColumnGen(IChunkColumnGenerateRequest request) in D:\Rivers\Rivers\src\WorldGenSystems\NewGenTerra.cs:line 340
   at Vintagestory.Server.ServerSystemSupplyChunks.runGenerators(ChunkColumnLoadRequest chunkRequest, Int32 forPass) in C:\Users\Tyron\Documents\vintagestory\game\VintagestoryLib\Server\Systems\World\LoadThread\SupplyChunks.cs:line 1733

Getting this error when running /wgen regen to fix some broken terrain