diff --git a/CHANGELOG.unreleased.md b/CHANGELOG.unreleased.md
index d29e49d28aa..835f41e0377 100644
--- a/CHANGELOG.unreleased.md
+++ b/CHANGELOG.unreleased.md
@@ -11,14 +11,14 @@ For upgrade instructions, please check the [migration guide](MIGRATIONS.released
 [Commits](https://github.com/scalableminds/webknossos/compare/20.07.0...HEAD)
 
 ### Added
-- Added the possibility to delete datasets on disk from webKnossos. Use with care. [#4696]()(https://github.com/scalableminds/webknossos/pull/4696)
+- Added the possibility to delete datasets on disk from webKnossos. Use with care. [#4696](https://github.com/scalableminds/webknossos/pull/4696)
 
 ### Changed
 - When d/f switching is turned off and a slice is copied with the shortcut `v`, the previous slice used as the source will always be slice - 1 and `shift + v` will always take slice + 1 as the slice to copy from. [#4728](https://github.com/scalableminds/webknossos/pull/4728)
 - Disabled the autofill feature of the brush when using this tool to erase data. [#4729](https://github.com/scalableminds/webknossos/pull/4729)
 
 ### Fixed
-- 
+- Fixed tree groups when uploading NMLs with multi-component trees. [#4735](https://github.com/scalableminds/webknossos/pull/4735)
 
 ### Removed
 -
diff --git a/webknossos-tracingstore/app/com/scalableminds/webknossos/tracingstore/tracings/skeleton/MultiComponentTreeSplitter.scala b/webknossos-tracingstore/app/com/scalableminds/webknossos/tracingstore/tracings/skeleton/MultiComponentTreeSplitter.scala
index 0112d74d0a6..6e812bbb750 100644
--- a/webknossos-tracingstore/app/com/scalableminds/webknossos/tracingstore/tracings/skeleton/MultiComponentTreeSplitter.scala
+++ b/webknossos-tracingstore/app/com/scalableminds/webknossos/tracingstore/tracings/skeleton/MultiComponentTreeSplitter.scala
@@ -29,7 +29,7 @@ object MultiComponentTreeSplitter {
         val newTreeGroup = TreeGroup(tree.name, largestGroupId, List())
         val parentTreeGroupIdOpt: Option[Int] = tree.groupId
         parentTreeGroupIdOpt.foreach { parentTreeGroupId =>
-          treeGroupsMutable = addTreeGroupAsChild(treeGroups, parentTreeGroupId, newTreeGroup)
+          treeGroupsMutable = addTreeGroupAsChild(treeGroupsMutable, parentTreeGroupId, newTreeGroup)
         }
         if (parentTreeGroupIdOpt.isEmpty) {
           treeGroupsMutable = newTreeGroup +: treeGroupsMutable