diff --git a/src/widget/circlewidget.cpp b/src/widget/circlewidget.cpp
index 74bd0426a..2bb1fc7e9 100644
--- a/src/widget/circlewidget.cpp
+++ b/src/widget/circlewidget.cpp
@@ -40,9 +40,10 @@
 
 QHash<int, CircleWidget*> CircleWidget::circleList;
 
-CircleWidget::CircleWidget(FriendListWidget* parent, int id)
+CircleWidget::CircleWidget(const Core &_core, FriendListWidget* parent, int id)
     : CategoryWidget(parent)
     , id(id)
+    , core{_core}
 {
     setName(Settings::getInstance().getCircleName(id), false);
     circleList[id] = this;
@@ -113,7 +114,7 @@ void CircleWidget::contextMenuEvent(QContextMenuEvent* event)
 
             circleList.remove(replacedCircle);
         } else if (selectedItem == openAction) {
-            ContentDialog* dialog = new ContentDialog();
+            ContentDialog* dialog = new ContentDialog(core);
             emit newContentDialog(*dialog);
             for (int i = 0; i < friendOnlineLayout()->count(); ++i) {
                 QWidget* const widget = friendOnlineLayout()->itemAt(i)->widget();
diff --git a/src/widget/circlewidget.h b/src/widget/circlewidget.h
index 10f08100c..30673879b 100644
--- a/src/widget/circlewidget.h
+++ b/src/widget/circlewidget.h
@@ -22,12 +22,13 @@
 #include "categorywidget.h"
 
 class ContentDialog;
+class Core;
 
 class CircleWidget final : public CategoryWidget
 {
     Q_OBJECT
 public:
-    explicit CircleWidget(FriendListWidget* parent, int id);
+    explicit CircleWidget(const Core& _core, FriendListWidget* parent, int id);
     ~CircleWidget();
 
     void editName();
@@ -52,4 +53,6 @@ private:
 
     static QHash<int, CircleWidget*> circleList;
     int id;
+
+    const Core& core;
 };
diff --git a/src/widget/contentdialog.cpp b/src/widget/contentdialog.cpp
index bf9f92f0c..2a4bffc42 100644
--- a/src/widget/contentdialog.cpp
+++ b/src/widget/contentdialog.cpp
@@ -51,7 +51,7 @@ static const int minHeight = 220;
 static const QSize minSize(minHeight, minWidget);
 static const QSize defaultSize(720, 400);
 
-ContentDialog::ContentDialog(QWidget* parent)
+ContentDialog::ContentDialog(const Core &core, QWidget* parent)
     : ActivateDialog(parent, Qt::Window)
     , splitter{new QSplitter(this)}
     , friendLayout{new FriendListLayout(this)}
@@ -124,7 +124,7 @@ ContentDialog::ContentDialog(QWidget* parent)
     SplitterRestorer restorer(splitter);
     restorer.restore(s.getDialogSplitterState(), size());
 
-    username = Core::getInstance()->getUsername();
+    username = core.getUsername();
 
     setAcceptDrops(true);
 
diff --git a/src/widget/contentdialog.h b/src/widget/contentdialog.h
index a0d9836b4..519f85f6a 100644
--- a/src/widget/contentdialog.h
+++ b/src/widget/contentdialog.h
@@ -32,6 +32,7 @@ template <typename K, typename V>
 class QHash;
 
 class ContentLayout;
+class Core;
 class Friend;
 class FriendChatroom;
 class FriendListLayout;
@@ -48,7 +49,7 @@ class ContentDialog : public ActivateDialog, public IDialogs
 {
     Q_OBJECT
 public:
-    explicit ContentDialog(QWidget* parent = nullptr);
+    explicit ContentDialog(const Core& core, QWidget* parent = nullptr);
     ~ContentDialog() override;
 
     FriendWidget* addFriend(std::shared_ptr<FriendChatroom> chatroom, GenericChatForm* form);
diff --git a/src/widget/friendlistwidget.cpp b/src/widget/friendlistwidget.cpp
index 5cd9c897f..8cd927499 100644
--- a/src/widget/friendlistwidget.cpp
+++ b/src/widget/friendlistwidget.cpp
@@ -97,9 +97,10 @@ qint64 timeUntilTomorrow()
     return now.msecsTo(tomorrow);
 }
 
-FriendListWidget::FriendListWidget(Widget* parent, bool groupsOnTop)
+FriendListWidget::FriendListWidget(const Core &_core, Widget* parent, bool groupsOnTop)
     : QWidget(parent)
     , groupsOnTop(groupsOnTop)
+    , core{_core}
 {
     listLayout = new FriendListLayout();
     setLayout(listLayout);
@@ -671,7 +672,7 @@ CircleWidget* FriendListWidget::createCircleWidget(int id)
 
     assert(circleLayout != nullptr);
 
-    CircleWidget* circleWidget = new CircleWidget(this, id);
+    CircleWidget* circleWidget = new CircleWidget(core, this, id);
     emit connectCircleWidget(*circleWidget);
     circleLayout->addSortedWidget(circleWidget);
     connect(this, &FriendListWidget::onCompactChanged, circleWidget, &CircleWidget::onCompactChanged);
diff --git a/src/widget/friendlistwidget.h b/src/widget/friendlistwidget.h
index b7d313920..98f59f79d 100644
--- a/src/widget/friendlistwidget.h
+++ b/src/widget/friendlistwidget.h
@@ -42,7 +42,7 @@ class FriendListWidget : public QWidget
     Q_OBJECT
 public:
     using SortingMode = Settings::FriendListSortingMode;
-    explicit FriendListWidget(Widget* parent, bool groupsOnTop = true);
+    explicit FriendListWidget(const Core& _core, Widget* parent, bool groupsOnTop = true);
     ~FriendListWidget();
     void setMode(SortingMode mode);
     SortingMode getMode() const;
@@ -95,4 +95,6 @@ private:
     GenericChatItemLayout groupLayout;
     QVBoxLayout* activityLayout = nullptr;
     QTimer* dayTimer;
+
+    const Core& core;
 };
diff --git a/src/widget/widget.cpp b/src/widget/widget.cpp
index a6f86a6cd..115f52d83 100644
--- a/src/widget/widget.cpp
+++ b/src/widget/widget.cpp
@@ -247,7 +247,9 @@ void Widget::init()
 
     ui->searchContactFilterBox->setMenu(filterMenu);
 
-    contactListWidget = new FriendListWidget(this, settings.getGroupchatPosition());
+    core = &profile.getCore();
+
+    contactListWidget = new FriendListWidget(*core, this, settings.getGroupchatPosition());
     connect(contactListWidget, &FriendListWidget::searchCircle, this, &Widget::searchCircle);
     connect(contactListWidget, &FriendListWidget::connectCircleWidget, this,
             &Widget::connectCircleWidget);
@@ -278,8 +280,6 @@ void Widget::init()
     addFriendForm = new AddFriendForm(core->getSelfId());
     groupInviteForm = new GroupInviteForm;
 
-    core = &profile.getCore();
-
 #if UPDATE_CHECK_ENABLED
     updateCheck = std::unique_ptr<UpdateCheck>(new UpdateCheck(settings));
     connect(updateCheck.get(), &UpdateCheck::updateAvailable, this, &Widget::onUpdateAvailable);
@@ -1803,7 +1803,7 @@ void Widget::onUpdateAvailable()
 
 ContentDialog* Widget::createContentDialog() const
 {
-    ContentDialog* contentDialog = new ContentDialog();
+    ContentDialog* contentDialog = new ContentDialog(*core);
 
     registerContentDialog(*contentDialog);
     return contentDialog;