fbandroid/libraries/components/litho-rendercore-transitions/src/main/…

…java/com/facebook/litho/TransitionSet.java

Reviewed By: jocelynluizzi13

Differential Revision: D64387621

fbshipit-source-id: bb00116c8733f510987857e5fe9814fd8fa69347

litho-rendercore-transitions/src/main/java/com/facebook/litho/TransitionSet.java

@@ -20,6 +20,7 @@
 import com.facebook.litho.animation.AnimationBinding;
 import java.util.ArrayList;
 import java.util.List;
+import javax.annotation.Nullable;
 
 /** A set of {@link Transition}s. */
 @Nullsafe(Nullsafe.Mode.LOCAL)
@@ -39,7 +40,7 @@ <T extends Transition> TransitionSet(List<T> children) {
     }
   }
 
-  private void addChild(Transition child) {
+  private void addChild(@Nullable Transition child) {
     if (child instanceof Transition.BaseTransitionUnitsBuilder) {
       final ArrayList<? extends Transition> transitions =
           ((Transition.BaseTransitionUnitsBuilder) child).getTransitionUnits();