diff --git a/src/middlewares/har.ts b/src/middlewares/har.ts
index e4dd002..dd0f93c 100644
--- a/src/middlewares/har.ts
+++ b/src/middlewares/har.ts
@@ -17,15 +17,29 @@ export const HarMiddleware = (req: Request, res: Response, next: NextFunction) =
         return originalSend.call(this, body);
     };
 
-    res.once('finish', () => {
-        const HarEntry: Partial<Entry> = {
-            time: Date.now() - requestStartTime.getTime(),
-            startedDateTime: requestStartTimeStamp,
-            request: buildHarRequest(req),
-            response: buildHarResponse(res, { body: responseBody }),
-        }
+    res.once('finish', async () => {
+        try {
+            const mockId = res.locals.rq_metadata?.mockId;
+            // No matching mock (e.g. 404) means there's nothing to attach the log to.
+            if (!mockId) {
+                return;
+            }
+
+            const HarEntry: Partial<Entry> = {
+                time: Date.now() - requestStartTime.getTime(),
+                startedDateTime: requestStartTimeStamp,
+                request: buildHarRequest(req),
+                response: buildHarResponse(res, { body: responseBody }),
+            }
 
-        storageService.storeLog({ mockId: res.locals.rq_metadata.mockId, HarEntry, })
+            // Await so a rejected storeLog is caught here rather than surfacing
+            // as an unhandled rejection.
+            await storageService.storeLog({ mockId, HarEntry, })
+        } catch (error) {
+            // Never let a logging failure escape the finish handler — it would
+            // surface as an uncaught exception and can crash the process.
+            console.error("[HarMiddleware] Failed to store log", error);
+        }
     });
 
     next();