diff --git a/src/widgets/DisassemblyWidget.cpp b/src/widgets/DisassemblyWidget.cpp
index e53ebe76..06d951ee 100644
--- a/src/widgets/DisassemblyWidget.cpp
+++ b/src/widgets/DisassemblyWidget.cpp
@@ -40,7 +40,9 @@ DisassemblyWidget::DisassemblyWidget(MainWindow *main, QAction *action)
     ,   mDisasScrollArea(new DisassemblyScrollArea(this))
     ,   mDisasTextEdit(new DisassemblyTextEdit(this))
 {
-    setObjectName(main->getUniqueObjectName(getWidgetType()));
+    setObjectName(main
+                  ? main->getUniqueObjectName(getWidgetType())
+                  : getWidgetType());
 
     topOffset = bottomOffset = RVA_INVALID;
     cursorLineOffset = 0;
diff --git a/src/widgets/GraphWidget.cpp b/src/widgets/GraphWidget.cpp
index ea151610..9073bacf 100644
--- a/src/widgets/GraphWidget.cpp
+++ b/src/widgets/GraphWidget.cpp
@@ -6,7 +6,9 @@
 GraphWidget::GraphWidget(MainWindow *main, QAction *action) :
     MemoryDockWidget(CutterCore::MemoryWidgetType::Graph, main, action)
 {
-    setObjectName(main->getUniqueObjectName(getWidgetType()));
+    setObjectName(main
+                  ? main->getUniqueObjectName(getWidgetType())
+                  : getWidgetType());
 
     setAllowedAreas(Qt::AllDockWidgetAreas);
     graphView = new DisassemblerGraphView(this, seekable);
diff --git a/src/widgets/HexdumpWidget.cpp b/src/widgets/HexdumpWidget.cpp
index 35c3919d..95498b79 100644
--- a/src/widgets/HexdumpWidget.cpp
+++ b/src/widgets/HexdumpWidget.cpp
@@ -22,7 +22,9 @@ HexdumpWidget::HexdumpWidget(MainWindow *main, QAction *action) :
 {
     ui->setupUi(this);
 
-    setObjectName(main->getUniqueObjectName(getWidgetType()));
+    setObjectName(main
+                  ? main->getUniqueObjectName(getWidgetType())
+                  : getWidgetType());
 
     ui->copyMD5->setIcon(QIcon(":/img/icons/copy.svg"));
     ui->copySHA1->setIcon(QIcon(":/img/icons/copy.svg"));