diff --git a/src/app/main.cpp b/src/app/main.cpp
index 7f02ec67b..5ab06e28b 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -32,6 +32,7 @@
 #include <csignal>
 #include <cstdlib>
 #include <memory>
+#include <tuple>
 
 #if defined(Q_OS_UNIX)
 #include <sys/resource.h>
@@ -210,9 +211,7 @@ int main(int argc, char *argv[])
                 throw CommandLineParameterError(QObject::tr("You cannot use %1: qBittorrent is already running for this user.")
                                      .arg(u"-d (or --daemon)"_qs));
             }
-            else
 #endif
-            qDebug("qBittorrent is already running for this user.");
 
             QThread::msleep(300);
             app->sendParams(params.paramList());
@@ -318,17 +317,13 @@ int main(int argc, char *argv[])
 void reportToUser(const char *str)
 {
     const size_t strLen = strlen(str);
-#ifndef Q_OS_WIN
-    if (write(STDERR_FILENO, str, strLen) < static_cast<ssize_t>(strLen))
-    {
-        const auto dummy = write(STDOUT_FILENO, str, strLen);
+#ifdef Q_OS_WIN
+    if (_write(_fileno(stderr), str, strLen) < static_cast<int>(strLen))
+        std::ignore = _write(_fileno(stdout), str, strLen);
 #else
-    if (_write(STDERR_FILENO, str, strLen) < static_cast<ssize_t>(strLen))
-    {
-        const auto dummy = _write(STDOUT_FILENO, str, strLen);
+    if (write(STDERR_FILENO, str, strLen) < static_cast<ssize_t>(strLen))
+        std::ignore = write(STDOUT_FILENO, str, strLen);
 #endif
-        Q_UNUSED(dummy);
-    }
 }
 #endif
 
@@ -357,8 +352,10 @@ void sigAbnormalHandler(int signum)
     reportToUser(msg);
     reportToUser(sigName);
     reportToUser("\n");
+#if !defined Q_OS_WIN
     print_stacktrace();  // unsafe
 #endif
+#endif
 
 #if defined Q_OS_WIN && !defined DISABLE_GUI
     StacktraceDialog dlg;  // unsafe