diff --git a/.github/workflows/pr-checks.yml b/.github/workflows/pr-checks.yml
index fdf0dcac1..a742b2636 100644
--- a/.github/workflows/pr-checks.yml
+++ b/.github/workflows/pr-checks.yml
@@ -119,11 +119,16 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v6
         with:
-          depth: 1
+          fetch-depth: 1
 
       - id: head-version
         name: Determine Node version for HEAD
         run: |
+          if [[ ! -f ".nvmrc" ]]; then
+            echo "::error::Cannot find .nvmrc in the HEAD commit."
+            exit 1
+          fi
+
           NODE_VERSION=$(cat .nvmrc)
           echo "NODE_VERSION: ${NODE_VERSION}"
           echo "node_version=${NODE_VERSION}" >> $GITHUB_OUTPUT
@@ -133,12 +138,17 @@ jobs:
         uses: actions/checkout@v6
         with:
           ref: ${{ env.BASE_REF }}
-          depth: 1
+          fetch-depth: 1
 
       - name: 'Backport: Verify Node versions unchanged'
         env:
           HEAD_VERSION: ${{ steps.head-version.outputs.node_version }}
         run: |
+          if [[ ! -f ".nvmrc" ]]; then
+            echo "::error::Cannot find .nvmrc in the base commit."
+            exit 1
+          fi
+
           BASE_VERSION=$(cat .nvmrc)
           echo "HEAD_VERSION: ${HEAD_VERSION}"
           echo "BASE_VERSION: ${BASE_VERSION}"
diff --git a/build.mjs b/build.mjs
index 410ac3d52..e6a17ae5c 100644
--- a/build.mjs
+++ b/build.mjs
@@ -83,7 +83,7 @@ const checkNodeVersionsPlugin = {
       }
 
       // Write the node version to `.nvmrc`.
-      writeFile(
+      await writeFile(
         join(__dirname, ".nvmrc"),
         nodeVersion.substring("node".length) + "\n",
         "utf-8",