diff --git a/lib/processMultipart.js b/lib/processMultipart.js
index de61e1d..990639b 100644
--- a/lib/processMultipart.js
+++ b/lib/processMultipart.js
@@ -31,11 +31,23 @@ module.exports = (options, req, res, next) => {
   const busboyOptions = buildOptions(options, { headers: req.headers });
   const busboy = Busboy(busboyOptions);
 
-  // Close connection with specified reason and http code, default: 400 Bad Request.
+  /**
+   * Closes connection with specified reason and http code.
+   * @param {number} code HTTP response code, default: 400.
+   * @param {*} reason Reason to close connection, default: 'Bad Request'.
+   */
   const closeConnection = (code, reason) => {
     req.unpipe(busboy);
-    res.writeHead(code || 400, { Connection: 'close' });
-    res.end(reason || 'Bad Request');
+    req.resume();
+    if (res.headersSent) {
+      debugLog(options, 'Headers already sent, can\'t close connection.');
+      return;
+    }
+    const resCode = code || 400;
+    const resReason = reason || 'Bad Request';
+    debugLog(options, `Closing connection with ${resCode}: ${resReason}`);
+    res.writeHead(resCode, { Connection: 'close' });
+    res.end(resReason);
   };
 
   // Express proxies sometimes attach multipart data to a buffer
@@ -87,11 +99,13 @@ module.exports = (options, req, res, next) => {
       // Reset upload timer in case of file limit reached.
       uploadTimer.clear();
       // Run a user defined limit handler if it has been set.
-      if (isFunc(options.limitHandler)) return options.limitHandler(req, res, next);
+      if (isFunc(options.limitHandler)) {
+        options.limitHandler(req, res, next);
+      }
       // Close connection with 413 code and do cleanup if abortOnLimit set(default: false).
       if (options.abortOnLimit) {
         debugLog(options, `Aborting upload because of size limit ${field}->${filename}.`);
-        !isFunc(options.limitHandler) ? closeConnection(413, options.responseOnLimit) : '';
+        closeConnection(413, options.responseOnLimit);
         cleanup();
       }
     });