diff --git a/dist/index.js b/dist/index.js
index 85db4e7f1..a916c4d01 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -74454,20 +74454,31 @@ const packageLockFilename = path.join(
 )
 
 const useYarn = () => fs.existsSync(yarnFilename)
-
 const usePnpm = () => fs.existsSync(pnpmLockFilename)
+const useNpm = () => fs.existsSync(packageLockFilename)
 
 const lockHash = () => {
   const lockFilename = useYarn()
     ? yarnFilename
     : usePnpm()
     ? pnpmLockFilename
-    : packageLockFilename
+    : useNpm()
+    ? packageLockFilename
+    : noLockFile()
   const fileHash = hasha.fromFileSync(lockFilename)
   debug(`Hash from file ${lockFilename} is ${fileHash}`)
   return fileHash
 }
 
+const noLockFile = () => {
+  core.error(
+    `Action failed. Missing package manager lockfile. ` +
+      `Expecting one of package-lock.json (npm), pnpm-lock.yaml (pnpm) or yarn.lock (yarn) in working-directory ` +
+      workingDirectory
+  )
+  process.exit(1)
+}
+
 // enforce the same NPM cache folder across different operating systems
 const NPM_CACHE_FOLDER = path.join(homeDirectory, '.npm')
 const getNpmCache = () => {
diff --git a/index.js b/index.js
index 72b07f359..459ebf011 100644
--- a/index.js
+++ b/index.js
@@ -103,20 +103,31 @@ const packageLockFilename = path.join(
 )
 
 const useYarn = () => fs.existsSync(yarnFilename)
-
 const usePnpm = () => fs.existsSync(pnpmLockFilename)
+const useNpm = () => fs.existsSync(packageLockFilename)
 
 const lockHash = () => {
   const lockFilename = useYarn()
     ? yarnFilename
     : usePnpm()
     ? pnpmLockFilename
-    : packageLockFilename
+    : useNpm()
+    ? packageLockFilename
+    : noLockFile()
   const fileHash = hasha.fromFileSync(lockFilename)
   debug(`Hash from file ${lockFilename} is ${fileHash}`)
   return fileHash
 }
 
+const noLockFile = () => {
+  core.error(
+    `Action failed. Missing package manager lockfile. ` +
+      `Expecting one of package-lock.json (npm), pnpm-lock.yaml (pnpm) or yarn.lock (yarn) in working-directory ` +
+      workingDirectory
+  )
+  process.exit(1)
+}
+
 // enforce the same NPM cache folder across different operating systems
 const NPM_CACHE_FOLDER = path.join(homeDirectory, '.npm')
 const getNpmCache = () => {