diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.new.js b/packages/react-reconciler/src/ReactFiberCommitWork.new.js
index a9c54d9c02e98..84a20638ef299 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.new.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.new.js
@@ -1074,6 +1074,7 @@ function detachFiberMutation(fiber: Fiber) {
   // and one of its descendants throws while unmounting a passive effect.
   fiber.alternate = null;
   fiber.child = null;
+  fiber.deletions = null;
   fiber.dependencies = null;
   fiber.firstEffect = null;
   fiber.lastEffect = null;
diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.old.js b/packages/react-reconciler/src/ReactFiberCommitWork.old.js
index c134ecccddbb9..94d137c99bdc2 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.old.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.old.js
@@ -1074,6 +1074,7 @@ function detachFiberMutation(fiber: Fiber) {
   // and one of its descendants throws while unmounting a passive effect.
   fiber.alternate = null;
   fiber.child = null;
+  fiber.deletions = null;
   fiber.dependencies = null;
   fiber.firstEffect = null;
   fiber.lastEffect = null;