diff --git a/GitGitGadget/index.js b/GitGitGadget/index.js
index c26145e..17623e0 100644
--- a/GitGitGadget/index.js
+++ b/GitGitGadget/index.js
@@ -21,7 +21,6 @@ module.exports = async (context, req) => {
             status: 403,
             body: 'Not a valid GitHub webhook: ' + e,
         };
-        context.done();
         return;
     }
 
@@ -112,7 +111,6 @@ module.exports = async (context, req) => {
                 context.res = {
                     body: `Not a command: '${comment.body}'`,
                 };
-                context.done();
                 return;
             }
 
@@ -131,12 +129,10 @@ module.exports = async (context, req) => {
             };
         }
     } catch (e) {
-        context.log('Caught exception ' + e);
+        context.log('Caught exception ', e);
         context.res = {
             status: 500,
-            body: 'Caught an error: ' + e,
+            body: `Caught an error: ${e.message || JSON.stringify(e, null, 2)}`,
         };
     }
-
-    context.done();
 };
diff --git a/__tests__/index.test.js b/__tests__/index.test.js
index 7db164e..797d958 100644
--- a/__tests__/index.test.js
+++ b/__tests__/index.test.js
@@ -49,7 +49,7 @@ test('reject requests other than webhook payloads', async () => {
             body: `Not a valid GitHub webhook: Error: ${message}`,
             status: 403
         })
-        expect(context.done).toHaveBeenCalledTimes(1)
+        expect(context.done).not.toHaveBeenCalled()
     }
 
     await expectInvalidWebhook('Unexpected content type: text/plain')
@@ -142,7 +142,7 @@ const testIssueComment = (comment, repoOwner, fn) => {
         try {
             expect(await index(context, context.req)).toBeUndefined()
             await fn(context)
-            expect(context.done).toHaveBeenCalledTimes(1)
+            expect(context.done).not.toHaveBeenCalled()
         } catch (e) {
             context.log.mock.calls.forEach(e => console.log(e[0]))
             throw e;
@@ -151,7 +151,7 @@ const testIssueComment = (comment, repoOwner, fn) => {
 }
 
 testIssueComment('/test', async (context) => {
-    expect(context.done).toHaveBeenCalledTimes(1)
+    expect(context.done).not.toHaveBeenCalled()
     expect(context.res).toEqual({
         body: 'Okay, triggered <the URL to the workflow handle-pr-comment.yml run on main with inputs {"pr-comment-url":"https://github.com/gitgitgadget/git/pull/1886743660"}>!'
     })
@@ -160,7 +160,7 @@ testIssueComment('/test', async (context) => {
 })
 
 testIssueComment('/verify-repository', 'nope', (context) => {
-    expect(context.done).toHaveBeenCalledTimes(1)
+    expect(context.done).not.toHaveBeenCalled()
     expect(context.res).toEqual({
         body: 'Refusing to work on a repository other than gitgitgadget/git or git/git',
         'status': 403,
@@ -178,7 +178,7 @@ const testWebhookPayload = (testLabel, gitHubEvent, payload, fn) => {
         try {
             expect(await index(context, context.req)).toBeUndefined()
             await fn(context)
-            expect(context.done).toHaveBeenCalledTimes(1)
+            expect(context.done).not.toHaveBeenCalled()
         } catch (e) {
             context.log.mock.calls.forEach(e => console.log(e[0]))
             throw e;
@@ -305,4 +305,4 @@ testWebhookPayload('react to PR push', 'pull_request', {
             'pr-url': 'https://github.com/gitgitgadget/git/pull/1956',
         }
     ])
-})
\ No newline at end of file
+})