diff --git a/chatterino.pro b/chatterino.pro
index 645a3bf57..9cb48cafb 100644
--- a/chatterino.pro
+++ b/chatterino.pro
@@ -312,7 +312,8 @@ HEADERS  += \
     src/widgets/attachedwindow.hpp \
     src/util/tupletablemodel.hpp \
     src/widgets/settingspages/externaltoolspage.hpp \
-    src/util/removescrollareabackground.hpp
+    src/util/removescrollareabackground.hpp \
+    src/util/assertinguithread.h
 
 RESOURCES += \
     resources/resources.qrc
diff --git a/src/providers/irc/abstractircserver.cpp b/src/providers/irc/abstractircserver.cpp
index 266279cc3..aad9f8c79 100644
--- a/src/providers/irc/abstractircserver.cpp
+++ b/src/providers/irc/abstractircserver.cpp
@@ -69,7 +69,7 @@ void AbstractIrcServer::connect()
     }
 
     this->onConnected();
-    this->connected.invoke();
+    //    this->connected.invoke();
 }
 
 void AbstractIrcServer::disconnect()
diff --git a/src/providers/twitch/twitchaccountmanager.cpp b/src/providers/twitch/twitchaccountmanager.cpp
index b651a8b2e..47c556203 100644
--- a/src/providers/twitch/twitchaccountmanager.cpp
+++ b/src/providers/twitch/twitchaccountmanager.cpp
@@ -9,8 +9,8 @@ namespace providers {
 namespace twitch {
 
 TwitchAccountManager::TwitchAccountManager()
+    : anonymousUser(new TwitchAccount(ANONYMOUS_USERNAME, "", "", ""))
 {
-    this->anonymousUser.reset(new TwitchAccount(ANONYMOUS_USERNAME, "", "", ""));
 }
 
 std::shared_ptr<TwitchAccount> TwitchAccountManager::getCurrent()
diff --git a/src/providers/twitch/twitchserver.cpp b/src/providers/twitch/twitchserver.cpp
index 3fe7e07a9..db084de7c 100644
--- a/src/providers/twitch/twitchserver.cpp
+++ b/src/providers/twitch/twitchserver.cpp
@@ -21,9 +21,10 @@ TwitchServer::TwitchServer()
     , mentionsChannel(new Channel("/mentions", Channel::TwitchMentions))
     , watchingChannel(Channel::getEmpty(), Channel::TwitchWatching)
 {
-    AccountManager::getInstance().Twitch.userChanged.connect([this]() {  //
-        util::postToThread([this] { this->connect(); });
-    });
+    qDebug() << "init TwitchServer";
+
+    AccountManager::getInstance().Twitch.userChanged.connect(
+        [this]() { util::postToThread([this] { this->connect(); }); });
 }
 
 TwitchServer &TwitchServer::getInstance()
@@ -36,6 +37,8 @@ void TwitchServer::initializeConnection(IrcConnection *connection, bool isRead,
 {
     std::shared_ptr<TwitchAccount> account = AccountManager::getInstance().Twitch.getCurrent();
 
+    qDebug() << "logging in as" << account->getUserName();
+
     QString username = account->getUserName();
     //    QString oauthClient = account->getOAuthClient();
     QString oauthToken = account->getOAuthToken();
diff --git a/src/singletons/accountmanager.cpp b/src/singletons/accountmanager.cpp
index 089ea4208..236aea1dd 100644
--- a/src/singletons/accountmanager.cpp
+++ b/src/singletons/accountmanager.cpp
@@ -17,6 +17,11 @@ inline QString getEnvString(const char *target)
 
 }  // namespace
 
+AccountManager::AccountManager()
+{
+    qDebug() << "init AccountManager";
+}
+
 AccountManager &AccountManager::getInstance()
 {
     static AccountManager instance;
diff --git a/src/singletons/accountmanager.hpp b/src/singletons/accountmanager.hpp
index 9528e3911..774ebb6fc 100644
--- a/src/singletons/accountmanager.hpp
+++ b/src/singletons/accountmanager.hpp
@@ -7,7 +7,7 @@ namespace singletons {
 
 class AccountManager
 {
-    AccountManager() = default;
+    AccountManager();
 
 public:
     static AccountManager &getInstance();
diff --git a/src/singletons/commandmanager.cpp b/src/singletons/commandmanager.cpp
index d509c7605..3818e6dd4 100644
--- a/src/singletons/commandmanager.cpp
+++ b/src/singletons/commandmanager.cpp
@@ -17,6 +17,11 @@ using namespace chatterino::providers::twitch;
 namespace chatterino {
 namespace singletons {
 
+CommandManager::CommandManager()
+{
+    qDebug() << "init CommandManager";
+}
+
 CommandManager &CommandManager::getInstance()
 {
     static CommandManager instance;
diff --git a/src/singletons/commandmanager.hpp b/src/singletons/commandmanager.hpp
index 20c56cc25..4904bb656 100644
--- a/src/singletons/commandmanager.hpp
+++ b/src/singletons/commandmanager.hpp
@@ -16,7 +16,7 @@ namespace singletons {
 
 class CommandManager
 {
-    CommandManager() = default;
+    CommandManager();
 
 public:
     static CommandManager &getInstance();
diff --git a/src/singletons/emotemanager.cpp b/src/singletons/emotemanager.cpp
index 83fdf9a37..98c6f92d7 100644
--- a/src/singletons/emotemanager.cpp
+++ b/src/singletons/emotemanager.cpp
@@ -79,6 +79,7 @@ void FillInFFZEmoteData(const QJsonObject &urls, const QString &code, const QStr
 EmoteManager::EmoteManager()
     : findShortCodesRegex(":([-+\\w]+):")
 {
+    qDebug() << "init EmoteManager";
     auto &accountManager = AccountManager::getInstance();
 
     accountManager.Twitch.userChanged.connect([this] {
diff --git a/src/singletons/fontmanager.cpp b/src/singletons/fontmanager.cpp
index 452149176..61060cc10 100644
--- a/src/singletons/fontmanager.cpp
+++ b/src/singletons/fontmanager.cpp
@@ -24,6 +24,8 @@ FontManager::FontManager()
     , currentFontSize("/appearance/currentFontSize", DEFAULT_FONT_SIZE)
 //    , currentFont(this->currentFontFamily.getValue().c_str(), currentFontSize.getValue())
 {
+    qDebug() << "init FontManager";
+
     this->currentFontFamily.connect([this](const std::string &newValue, auto) {
         this->incGeneration();
         //        this->currentFont.setFamily(newValue.c_str());
@@ -41,7 +43,6 @@ FontManager::FontManager()
 FontManager &FontManager::getInstance()
 {
     static FontManager instance;
-
     return instance;
 }
 
diff --git a/src/singletons/loggingmanager.cpp b/src/singletons/loggingmanager.cpp
index 943077a1a..d25a9ace5 100644
--- a/src/singletons/loggingmanager.cpp
+++ b/src/singletons/loggingmanager.cpp
@@ -14,6 +14,7 @@ namespace singletons {
 LoggingManager::LoggingManager()
     : pathManager(PathManager::getInstance())
 {
+    qDebug() << "init LoggingManager";
 }
 
 LoggingManager &LoggingManager::getInstance()
diff --git a/src/singletons/nativemessagingmanager.cpp b/src/singletons/nativemessagingmanager.cpp
index 9c3bb907d..c0e0dbdd9 100644
--- a/src/singletons/nativemessagingmanager.cpp
+++ b/src/singletons/nativemessagingmanager.cpp
@@ -32,6 +32,7 @@ namespace singletons {
 
 NativeMessagingManager::NativeMessagingManager()
 {
+    qDebug() << "init NativeMessagingManager";
 }
 
 NativeMessagingManager &NativeMessagingManager::getInstance()
diff --git a/src/singletons/pathmanager.cpp b/src/singletons/pathmanager.cpp
index 3fd3f6dc6..0e893df34 100644
--- a/src/singletons/pathmanager.cpp
+++ b/src/singletons/pathmanager.cpp
@@ -8,6 +8,11 @@
 namespace chatterino {
 namespace singletons {
 
+PathManager::PathManager()
+{
+    qDebug() << "init PathManager";
+}
+
 PathManager &PathManager::getInstance()
 {
     static PathManager instance;
diff --git a/src/singletons/pathmanager.hpp b/src/singletons/pathmanager.hpp
index 10ba3ab62..b0fb8243f 100644
--- a/src/singletons/pathmanager.hpp
+++ b/src/singletons/pathmanager.hpp
@@ -7,7 +7,7 @@ namespace singletons {
 
 class PathManager
 {
-    PathManager() = default;
+    PathManager();
 
 public:
     static PathManager &getInstance();
diff --git a/src/singletons/pubsubmanager.cpp b/src/singletons/pubsubmanager.cpp
index 044c205b9..bc84ede1b 100644
--- a/src/singletons/pubsubmanager.cpp
+++ b/src/singletons/pubsubmanager.cpp
@@ -172,6 +172,8 @@ bool PubSubClient::Send(const char *payload)
 
 PubSubManager::PubSubManager()
 {
+    qDebug() << "init PubSubManager";
+
     this->moderationActionHandlers["clear"] = [this](const auto &data, const auto &roomID) {
         ClearChatAction action(data, roomID);
 
@@ -444,7 +446,6 @@ void PubSubManager::AddClient()
 PubSubManager &PubSubManager::getInstance()
 {
     static PubSubManager instance;
-
     return instance;
 }
 
diff --git a/src/singletons/resourcemanager.cpp b/src/singletons/resourcemanager.cpp
index 5ae369f1f..c394f8149 100644
--- a/src/singletons/resourcemanager.cpp
+++ b/src/singletons/resourcemanager.cpp
@@ -288,6 +288,8 @@ ResourceManager::ResourceManager()
     , buttonBan(lli(":/images/button_ban.png", 0.25))
     , buttonTimeout(lli(":/images/button_timeout.png", 0.25))
 {
+    qDebug() << "init ResourceManager";
+
     this->loadDynamicTwitchBadges();
 
     this->loadChatterinoBadges();
diff --git a/src/singletons/settingsmanager.cpp b/src/singletons/settingsmanager.cpp
index 5f2eed2d3..56ca824fe 100644
--- a/src/singletons/settingsmanager.cpp
+++ b/src/singletons/settingsmanager.cpp
@@ -20,6 +20,8 @@ SettingManager::SettingManager()
     : snapshot(nullptr)
     , _ignoredKeywords(new std::vector<QString>)
 {
+    qDebug() << "init SettingManager";
+
     this->wordFlagsListener.addSetting(this->showTimestamps);
     this->wordFlagsListener.addSetting(this->showBadges);
     this->wordFlagsListener.addSetting(this->enableBttvEmotes);
diff --git a/src/singletons/thememanager.cpp b/src/singletons/thememanager.cpp
index e7d3a6be2..87329ccaa 100644
--- a/src/singletons/thememanager.cpp
+++ b/src/singletons/thememanager.cpp
@@ -38,6 +38,8 @@ ThemeManager::ThemeManager()
     : themeName("/appearance/theme/name", "Dark")
     , themeHue("/appearance/theme/hue", 0.0)
 {
+    qDebug() << "init ThemeManager";
+
     this->update();
 
     this->themeName.connectSimple([this](auto) { this->update(); });
diff --git a/src/singletons/updatemanager.cpp b/src/singletons/updatemanager.cpp
index 87f312525..73b99717e 100644
--- a/src/singletons/updatemanager.cpp
+++ b/src/singletons/updatemanager.cpp
@@ -9,6 +9,7 @@ namespace singletons {
 UpdateManager::UpdateManager()
     : currentVersion(CHATTERINO_VERSION)
 {
+    qDebug() << "init UpdateManager";
 }
 
 UpdateManager &UpdateManager::getInstance()
diff --git a/src/singletons/windowmanager.cpp b/src/singletons/windowmanager.cpp
index 50d66e503..e5908aa7b 100644
--- a/src/singletons/windowmanager.cpp
+++ b/src/singletons/windowmanager.cpp
@@ -4,6 +4,7 @@
 #include "singletons/fontmanager.hpp"
 #include "singletons/pathmanager.hpp"
 #include "singletons/thememanager.hpp"
+#include "util/assertinguithread.h"
 #include "widgets/accountswitchpopupwidget.hpp"
 #include "widgets/settingsdialog.hpp"
 
@@ -55,6 +56,7 @@ void WindowManager::showAccountSelectPopup(QPoint point)
 WindowManager::WindowManager(ThemeManager &_themeManager)
     : themeManager(_themeManager)
 {
+    qDebug() << "init WindowManager";
     _themeManager.repaintVisibleChatWidgets.connect([this] { this->repaintVisibleChatWidgets(); });
 }
 
@@ -84,16 +86,22 @@ void WindowManager::repaintGifEmotes()
 
 widgets::Window &WindowManager::getMainWindow()
 {
+    util::assertInGuiThread();
+
     return *this->mainWindow;
 }
 
 widgets::Window &WindowManager::getSelectedWindow()
 {
+    util::assertInGuiThread();
+
     return *this->selectedWindow;
 }
 
 widgets::Window &WindowManager::createWindow(widgets::Window::WindowType type)
 {
+    util::assertInGuiThread();
+
     auto *window = new widgets::Window(this->themeManager, type);
     this->windows.push_back(window);
     window->show();
@@ -121,6 +129,8 @@ int WindowManager::windowCount()
 
 widgets::Window *WindowManager::windowAt(int index)
 {
+    util::assertInGuiThread();
+
     if (index < 0 || (size_t)index >= this->windows.size()) {
         return nullptr;
     }
@@ -131,6 +141,8 @@ widgets::Window *WindowManager::windowAt(int index)
 
 void WindowManager::initialize()
 {
+    util::assertInGuiThread();
+
     assert(!this->initialized);
 
     // load file
@@ -217,6 +229,8 @@ void WindowManager::initialize()
 
 void WindowManager::save()
 {
+    util::assertInGuiThread();
+
     QJsonDocument document;
 
     // "serialize"
@@ -296,6 +310,8 @@ void WindowManager::save()
 
 void WindowManager::encodeChannel(IndirectChannel channel, QJsonObject &obj)
 {
+    util::assertInGuiThread();
+
     switch (channel.getType()) {
         case Channel::Twitch: {
             obj.insert("type", "twitch");
@@ -315,6 +331,8 @@ void WindowManager::encodeChannel(IndirectChannel channel, QJsonObject &obj)
 
 IndirectChannel WindowManager::decodeChannel(const QJsonObject &obj)
 {
+    util::assertInGuiThread();
+
     QString type = obj.value("type").toString();
     if (type == "twitch") {
         return providers::twitch::TwitchServer::getInstance().getOrAddChannel(
@@ -332,6 +350,8 @@ IndirectChannel WindowManager::decodeChannel(const QJsonObject &obj)
 
 void WindowManager::closeAll()
 {
+    util::assertInGuiThread();
+
     for (widgets::Window *window : windows) {
         window->close();
     }
diff --git a/src/util/assertinguithread.h b/src/util/assertinguithread.h
new file mode 100644
index 000000000..f9ce99fde
--- /dev/null
+++ b/src/util/assertinguithread.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include <QCoreApplication>
+#include <QThread>
+#include <cassert>
+
+namespace chatterino {
+namespace util {
+
+void assertInGuiThread()
+{
+#ifdef _DEBUG
+    assert(QCoreApplication::instance()->thread() == QThread::currentThread());
+#endif
+}
+
+}  // namespace util
+}  // namespace chatterino
diff --git a/src/widgets/window.cpp b/src/widgets/window.cpp
index 7c7504c29..974a3165d 100644
--- a/src/widgets/window.cpp
+++ b/src/widgets/window.cpp
@@ -16,8 +16,7 @@
 #include <QShortcut>
 #include <QVBoxLayout>
 
-#include <QTableView>
-#include "util/tupletablemodel.hpp"
+#include <QStandardItemModel>
 
 namespace chatterino {
 namespace widgets {