diff --git a/.github/workflows/failure-cases.yml b/.github/workflows/failure-cases.yml
index fa91cd4..9565917 100644
--- a/.github/workflows/failure-cases.yml
+++ b/.github/workflows/failure-cases.yml
@@ -11,26 +11,27 @@ env:
   CACHE_KEY_PREFIX: ${{github.workflow}}#${{github.run_number}}-
 
 jobs:
+
   wrapper-missing:
+    continue-on-error: true
     runs-on: ubuntu-latest
     steps:
     - name: Checkout sources
       uses: actions/checkout@v2
     - name: Test wrapper missing
       uses: ./
-      continue-on-error: true
       with:
         build-root-directory: __tests__/samples/no-wrapper
         arguments: help
 
   bad-configuration:
+    continue-on-error: true
     runs-on: ubuntu-latest
     steps:
     - name: Checkout sources
       uses: actions/checkout@v2
     - name: Test bad config value
       uses: ./
-      continue-on-error: true
       with:
         build-root-directory: __tests__/samples/no-wrapper
         arguments: help
diff --git a/src/main.ts b/src/main.ts
index 5896098..0445f10 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -9,12 +9,12 @@ import * as provision from './provision'
 
 // Invoked by GitHub Actions
 export async function run(): Promise<void> {
-    const workspaceDirectory = process.env[`GITHUB_WORKSPACE`] || ''
-    const buildRootDirectory = resolveBuildRootDirectory(workspaceDirectory)
-
-    await caches.restore(buildRootDirectory)
-
     try {
+        const workspaceDirectory = process.env[`GITHUB_WORKSPACE`] || ''
+        const buildRootDirectory = resolveBuildRootDirectory(workspaceDirectory)
+
+        await caches.restore(buildRootDirectory)
+
         const args: string[] = parseCommandLineArguments()
         // TODO: instead of running with no-daemon, run `--stop` in post action.
         args.push('--no-daemon')
@@ -39,10 +39,10 @@ export async function run(): Promise<void> {
             core.setFailed(`Gradle process exited with status ${result.status}`)
         }
     } catch (error) {
-        if (!(error instanceof Error)) {
-            throw error
+        core.setFailed(String(error))
+        if (error instanceof Error && error.stack) {
+            core.info(error.stack)
         }
-        core.setFailed(error.message)
     }
 }
 
diff --git a/src/post.ts b/src/post.ts
index 698ddf3..583be81 100644
--- a/src/post.ts
+++ b/src/post.ts
@@ -1,8 +1,16 @@
+import * as core from '@actions/core'
 import * as caches from './caches'
 
 // Invoked by GitHub Actions
 export async function run(): Promise<void> {
-    await caches.save()
+    try {
+        await caches.save()
+    } catch (error) {
+        core.setFailed(String(error))
+        if (error instanceof Error && error.stack) {
+            core.info(error.stack)
+        }
+    }
 }
 
 run()