minor correction

app/components/SimpleEditor/elements/track_change/TrackChangeComponent.js

@@ -72,9 +72,9 @@ class TrackChangeComponent extends AnnotationComponent {
       deleteNode(tx, { nodeId: nodeId })
       if (status === 'delete') self.context.surface.delete(tx, nodeData)
     })
-    const nextNodeData = self.buildNodeData(nextNodeId)
-    self.context.surface.setSelection(nextNodeData.selection)
-    self.context.controller.scrollTo(nextNodeId)
+    if (nextNodeId) {
+      this.focusToNext(nextNodeId)
+    }
   }
 
   rejectTrackChange () {
@@ -90,9 +90,10 @@ class TrackChangeComponent extends AnnotationComponent {
       deleteNode(tx, { nodeId: nodeId })
       if (status === 'add') self.context.surface.delete(tx, nodeData)
     })
-    const nextNodeData = self.buildNodeData(nextNodeId)
-    self.context.surface.setSelection(nextNodeData.selection)
-    self.context.controller.scrollTo(nextNodeId)
+
+    if (nextNodeId) {
+      this.focusToNext(nextNodeId)
+    }
   }
 
   buildNodeData (nodeId) {
@@ -139,6 +140,12 @@ class TrackChangeComponent extends AnnotationComponent {
     return
   }
 
+  focusToNext (nextNodeId) {
+    const nextNodeData = this.buildNodeData(nextNodeId)
+    this.context.surface.setSelection(nextNodeData.selection)
+    this.context.controller.scrollTo(nextNodeId)
+  }
+
   sortNodes (nodes) {
     let trackChanges = clone(nodes)
     const ds = this.getDocumentSession()