diff --git a/libs/services/src/lib/server-storage/server-api-client.spec.ts b/libs/services/src/lib/server-storage/server-api-client.spec.ts
index fceb84af6..241437275 100644
--- a/libs/services/src/lib/server-storage/server-api-client.spec.ts
+++ b/libs/services/src/lib/server-storage/server-api-client.spec.ts
@@ -110,6 +110,23 @@ describe('ServerApiClient', () => {
         expect(status.reportOffline).toHaveBeenCalledTimes(1);
     });
 
+    it('reports a keepalive answer cut off after its headers as offline', async () => {
+        const cutOff = jest.fn().mockResolvedValue({
+            ...response(200),
+            json: async () => {
+                throw new TypeError('body cut off');
+            },
+        });
+
+        // Saved, on a version it cannot tell (see the write queue).
+        await expect(
+            client(cutOff).sendKeepalive('PUT', '/user-state/a/b', {
+                value: 1,
+            })
+        ).resolves.toEqual({ status: 'saved', tag: undefined });
+        expect(status.reportOffline).toHaveBeenCalled();
+    });
+
     it('reports a gateway answering for a down backend on a keepalive write', async () => {
         const down = jest.fn().mockResolvedValue(response(502));
 
diff --git a/libs/services/src/lib/server-storage/server-api-client.ts b/libs/services/src/lib/server-storage/server-api-client.ts
index 3b309380b..7261f59e1 100644
--- a/libs/services/src/lib/server-storage/server-api-client.ts
+++ b/libs/services/src/lib/server-storage/server-api-client.ts
@@ -201,11 +201,12 @@ export class ServerApiClient {
                 signal: this.timeoutSignal(),
             });
             if (response.ok) {
-                const body = (await response
-                    .json()
-                    .catch(
-                        () => ({})
-                    )) as Partial<ServerUserStateWriteResponse>;
+                const body = (await response.json().catch(() => {
+                    // Saved, on a version it cannot tell: cut off after its
+                    // headers, which counts as offline, as for requests.
+                    this.options.status.reportOffline();
+                    return {};
+                })) as Partial<ServerUserStateWriteResponse>;
                 return { status: 'saved', tag: body?.tag };
             }
             if (GATEWAY_UNAVAILABLE.has(response.status)) {