Unhandled exception in Razor file when targeting net6.0 #4573

System.NullReferenceException: Object reference not set to an instance of an object
  at OmniSharp.Helpers.LocationExtensions+<>c__DisplayClass0_0.<GetQuickFix>b__3 (Microsoft.CodeAnalysis.Document d) [0x00000] in <7cebb9e2d32f406c90f8cf74ce960a45>:0 
  at System.Linq.Enumerable.TryGetFirst[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate, System.Boolean& found) [0x0003f] in <17e8581c65f940ca8137dd67206f5dbd>:0 
  at System.Linq.Enumerable.FirstOrDefault[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate) [0x00000] in <17e8581c65f940ca8137dd67206f5dbd>:0 
  at OmniSharp.Helpers.LocationExtensions.<GetQuickFix>g__GetSourceText|0_0 (Microsoft.CodeAnalysis.Location location, System.Collections.Generic.IEnumerable`1[T] documents, System.Boolean hasMappedPath) [0x00013] in <7cebb9e2d32f406c90f8cf74ce960a45>:0 
  at OmniSharp.Helpers.LocationExtensions.GetQuickFix (Microsoft.CodeAnalysis.Location location, OmniSharp.OmniSharpWorkspace workspace) [0x00056] in <7cebb9e2d32f406c90f8cf74ce960a45>:0 
  at OmniSharp.Roslyn.CSharp.Services.Navigation.FindUsagesService+<>c__DisplayClass3_0.<Handle>b__2 (Microsoft.CodeAnalysis.Location l) [0x00000] in <7cebb9e2d32f406c90f8cf74ce960a45>:0 
  at System.Linq.Enumerable+SelectEnumerableIterator`2[TSource,TResult].MoveNext () [0x00048] in <17e8581c65f940ca8137dd67206f5dbd>:0 
  at System.Linq.Set`1[TElement].UnionWith (System.Collections.Generic.IEnumerable`1[T] other) [0x00018] in <17e8581c65f940ca8137dd67206f5dbd>:0 
  at System.Linq.Enumerable+DistinctIterator`1[TSource].FillSet () [0x0000b] in <17e8581c65f940ca8137dd67206f5dbd>:0 
  at System.Linq.Enumerable+DistinctIterator`1[TSource].ToArray () [0x00000] in <17e8581c65f940ca8137dd67206f5dbd>:0 
  at System.Linq.Buffer`1[TElement]..ctor (System.Collections.Generic.IEnumerable`1[T] source) [0x0000a] in <17e8581c65f940ca8137dd67206f5dbd>:0 
  at System.Linq.OrderedEnumerable`1+<GetEnumerator>d__3[TElement].MoveNext () [0x0001e] in <17e8581c65f940ca8137dd67206f5dbd>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList (Newtonsoft.Json.JsonWriter writer, System.Collections.IEnumerable values, Newtonsoft.Json.Serialization.JsonArrayContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract collectionContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x000e1] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonContract valueContract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x000d6] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonObjectContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract collectionContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x0008d] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonContract valueContract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x000b2] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonObjectContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract collectionContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x0008d] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonContract valueContract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x000b2] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize (Newtonsoft.Json.JsonWriter jsonWriter, System.Object value, System.Type objectType) [0x00079] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.JsonSerializer.SerializeInternal (Newtonsoft.Json.JsonWriter jsonWriter, System.Object value, System.Type objectType) [0x0023a] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.JsonSerializer.Serialize (Newtonsoft.Json.JsonWriter jsonWriter, System.Object value, System.Type objectType) [0x00000] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.JsonConvert.SerializeObjectInternal (System.Object value, System.Type type, Newtonsoft.Json.JsonSerializer jsonSerializer) [0x00028] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.JsonConvert.SerializeObject (System.Object value, System.Type type, Newtonsoft.Json.JsonSerializerSettings settings) [0x00007] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at Newtonsoft.Json.JsonConvert.SerializeObject (System.Object value) [0x00000] in <2676a2da6edc420e890ed28aa4572ee5>:0 
  at OmniSharp.Protocol.Packet.ToString () [0x00000] in <32f893db32d8414b88ecbc8842ce6d2c>:0 
  at System.IO.TextWriter.WriteLine (System.Object value) [0x00028] in <b18e5763ec3f41e68a8fe16d7f5e0bee>:0 
  at System.IO.TextWriter+SyncTextWriter.WriteLine (System.Object value) [0x00000] in <b18e5763ec3f41e68a8fe16d7f5e0bee>:0 
  at (wrapper synchronized) System.IO.TextWriter+SyncTextWriter.WriteLine(object)
  at OmniSharp.Services.SharedTextWriter.ProcessWriteQueue () [0x0001d] in <32f893db32d8414b88ecbc8842ce6d2c>:0 
  at System.Threading.ThreadHelper.ThreadStart_Context (System.Object state) [0x00014] in <b18e5763ec3f41e68a8fe16d7f5e0bee>:0 
  at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00071] in <b18e5763ec3f41e68a8fe16d7f5e0bee>:0 
  at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00000] in <b18e5763ec3f41e68a8fe16d7f5e0bee>:0 
  at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) [0x0002b] in <b18e5763ec3f41e68a8fe16d7f5e0bee>:0 
  at System.Threading.ThreadHelper.ThreadStart () [0x00008] in <b18e5763ec3f41e68a8fe16d7f5e0bee>:0