diff --git a/scripts/report.mjs b/scripts/report.mjs
index 44bc0a8..5d69eb5 100644
--- a/scripts/report.mjs
+++ b/scripts/report.mjs
@@ -10,6 +10,11 @@ export function sha256(value) {
   return createHash('sha256').update(value).digest('hex');
 }
 
+export function hashFilesSingle(value) {
+  const contentHash = createHash('sha256').update(value).digest();
+  return createHash('sha256').update(contentHash).digest('hex');
+}
+
 export function secondsBetween(start, end) {
   if (!start || !end) return null;
   return (Date.parse(end) - Date.parse(start)) / 1000;
@@ -91,6 +96,7 @@ function summarize(rows, caches) {
     const versionCaches = caches.filter(cache => cache.version === version);
     const caseTotals = new Map();
     for (const cache of versionCaches) {
+      if (cache.sizeBytes === null) continue;
       const key = `${cache.distribution}-${cache.iteration}`;
       caseTotals.set(key, (caseTotals.get(key) ?? 0) + cache.sizeBytes);
     }
@@ -220,11 +226,13 @@ export async function main(env = process.env) {
     const expected = [
       {
         type: 'maven-dependencies',
-        key: `setup-java-Linux-x64-maven-${sha256(`${benchmarkId}\n`)}`
+        key: `setup-java-Linux-x64-maven-${hashFilesSingle(
+          `${benchmarkId}\n`
+        )}`
       },
       {
         type: 'maven-wrapper',
-        key: `setup-java-Linux-x64-maven-wrapper-${sha256(
+        key: `setup-java-Linux-x64-maven-wrapper-${hashFilesSingle(
           `${wrapperOriginal}# benchmark-id=${benchmarkId}\n`
         )}`
       }
diff --git a/scripts/report.test.mjs b/scripts/report.test.mjs
index 65cbdbe..e3381ab 100644
--- a/scripts/report.test.mjs
+++ b/scripts/report.test.mjs
@@ -2,6 +2,7 @@ import assert from 'node:assert/strict';
 import test from 'node:test';
 
 import {
+  hashFilesSingle,
   median,
   parseBenchmarkJob,
   secondsBetween,
@@ -13,6 +14,10 @@ test('hashes benchmark cache markers', () => {
     sha256('benchmark\n'),
     '8f8dbecfd77ab2386b49d723c6b2474f2c22c246805fa0f677bbaf6e4f7bbbfe'
   );
+  assert.equal(
+    hashFilesSingle('main-microsoft-1-30462682067\n'),
+    'f0c1009aeb8d8582a73a81f3b0146467ed727211971e4052fccd9b7d60817d8f'
+  );
 });
 
 test('calculates medians', () => {