diff --git a/lib/utilities/serverAccessLogger.js b/lib/utilities/serverAccessLogger.js
index b474cc81ef..a08bb4e337 100644
--- a/lib/utilities/serverAccessLogger.js
+++ b/lib/utilities/serverAccessLogger.js
@@ -416,11 +416,11 @@ function logServerAccess(req, res) {
         userName: params.analyticsUserName ?? undefined,
         httpMethod: req.method ?? undefined,
         bytesDeleted: params.analyticsBytesDeleted ?? undefined,
-        bytesReceived: req.parsedContentLength ?? undefined,
+        bytesReceived: Number.isInteger(req.parsedContentLength) ? req.parsedContentLength : undefined,
         bodyLength: req.headers['content-length'] !== undefined
             ? parseInt(req.headers['content-length'], 10)
             : undefined,
-        contentLength: req.parsedContentLength ?? undefined,
+        contentLength: Number.isInteger(req.parsedContentLength) ? req.parsedContentLength : undefined,
         // eslint-disable-next-line camelcase
         elapsed_ms: calculateElapsedMS(params.startTime, params.onCloseEndTime) ?? undefined,
 
diff --git a/package.json b/package.json
index 722bed4eec..e6fe2b0bdb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@zenko/cloudserver",
-  "version": "9.2.14",
+  "version": "9.2.15",
   "description": "Zenko CloudServer, an open-source Node.js implementation of a server handling the Amazon S3 protocol",
   "main": "index.js",
   "engines": {
diff --git a/tests/unit/utils/serverAccessLogger.js b/tests/unit/utils/serverAccessLogger.js
index 49aa1abae7..3dece84834 100644
--- a/tests/unit/utils/serverAccessLogger.js
+++ b/tests/unit/utils/serverAccessLogger.js
@@ -1122,6 +1122,29 @@ describe('serverAccessLogger utility functions', () => {
             assert.strictEqual(loggedData.errorCode, 'NoSuchKey');
             assert.strictEqual('errorCode' in loggedData, true);
         });
+
+        it('should omit NaN fields from log output', () => {
+            setServerAccessLogger(mockLogger);
+            const req = {
+                serverAccessLog: {},
+                headers: {},
+                parsedContentLength: NaN, // Simulates Number.parseInt('', 10)
+                socket: {},
+            };
+            const res = {
+                serverAccessLog: {},
+                getHeader: () => null,
+            };
+
+            logServerAccess(req, res);
+
+            assert.strictEqual(mockLogger.write.callCount, 1);
+            const loggedData = JSON.parse(mockLogger.write.firstCall.args[0].trim());
+
+            // NaN values should be omitted from the log output
+            assert.strictEqual('bytesReceived' in loggedData, false);
+            assert.strictEqual('contentLength' in loggedData, false);
+        });
     });
 });