diff --git a/.github/workflows/dismissed-review.yml b/.github/workflows/dismissed-review.yml
index 1d99c1c9cf06..224ea0af7249 100644
--- a/.github/workflows/dismissed-review.yml
+++ b/.github/workflows/dismissed-review.yml
@@ -49,7 +49,7 @@ jobs:
                     repo: context.repo.repo,
                     pull_number: pull_request.number
                   })).filter(review =>
-                    review.user.login == 'github-actions[bot]' &&
+                    review.user?.login == 'github-actions[bot]' &&
                     review.state == 'DISMISSED'
                   ).map(review => github.graphql(`
                     mutation($node_id:ID!) {
diff --git a/ci/github-script/reviews.js b/ci/github-script/reviews.js
index 107ec3975c98..f10f141d84cb 100644
--- a/ci/github-script/reviews.js
+++ b/ci/github-script/reviews.js
@@ -12,7 +12,7 @@ async function dismissReviews({ github, context, dry }) {
         pull_number,
       })
     )
-      .filter((review) => review.user.login === 'github-actions[bot]')
+      .filter((review) => review.user?.login === 'github-actions[bot]')
       .map(async (review) => {
         if (review.state === 'CHANGES_REQUESTED') {
           await github.rest.pulls.dismissReview({
@@ -46,7 +46,7 @@ async function postReview({ github, context, core, dry, body }) {
     })
   ).find(
     (review) =>
-      review.user.login === 'github-actions[bot]' &&
+      review.user?.login === 'github-actions[bot]' &&
       // If a review is still pending, we can just update this instead
       // of posting a new one.
       (review.state === 'CHANGES_REQUESTED' ||