diff --git a/ApplicationLibCode/ProjectDataModel/RimDockWindowController.cpp b/ApplicationLibCode/ProjectDataModel/RimDockWindowController.cpp
index 96d65030ed..e20b239603 100644
--- a/ApplicationLibCode/ProjectDataModel/RimDockWindowController.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimDockWindowController.cpp
@@ -145,6 +145,14 @@ void RimDockWindowController::updateViewerWidget()
                 return;
             }
 
+            // The dock manager identifies dock widgets by name. A duplicate name (e.g. from a project saved with
+            // copied views) would unregister the existing dock widget, which is then deleted on next dock state restore.
+            if ( auto existing = mainWindow->dockManager()->findDockWidget( viewPdmObject()->dockWindowName() );
+                 existing && existing != dockWidget )
+            {
+                viewPdmObject()->resetDockWindowId();
+            }
+
             dockWidget->setWidget( viewWidget );
             dockWidget->setObjectName( viewPdmObject()->dockWindowName() );
             viewWidget->setObjectName( viewPdmObject()->dockWindowName() );
diff --git a/ApplicationLibCode/ProjectDataModel/RimMultiPlot.cpp b/ApplicationLibCode/ProjectDataModel/RimMultiPlot.cpp
index 849faaf039..188ad5b9ba 100644
--- a/ApplicationLibCode/ProjectDataModel/RimMultiPlot.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimMultiPlot.cpp
@@ -34,6 +34,8 @@
 #include "cafPdmUiComboBoxEditor.h"
 #include "cafPdmUiToolButtonEditor.h"
 
+#include "DockWidget.h"
+
 #include <QPaintDevice>
 #include <QRegularExpression>
 
diff --git a/ApplicationLibCode/ProjectDataModel/RimViewWindow.cpp b/ApplicationLibCode/ProjectDataModel/RimViewWindow.cpp
index bfd16f701c..fd82104f51 100644
--- a/ApplicationLibCode/ProjectDataModel/RimViewWindow.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimViewWindow.cpp
@@ -60,6 +60,9 @@ RimViewWindow::RimViewWindow()
 
     CAF_PDM_InitField( &m_dockWindowId, "DockWindowId", QString(), "Dock Window Id" );
     m_dockWindowId.uiCapability()->setUiHidden( true );
+    // The dock id must be unique, as the dock manager identifies dock widgets by name. Copies (including plots created
+    // from templates) get a new id.
+    m_dockWindowId.xmlCapability()->setCopyable( false );
 }
 
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationLibCode/ProjectDataModel/RimViewWindow.h b/ApplicationLibCode/ProjectDataModel/RimViewWindow.h
index 4b35770d62..04b86b40b1 100644
--- a/ApplicationLibCode/ProjectDataModel/RimViewWindow.h
+++ b/ApplicationLibCode/ProjectDataModel/RimViewWindow.h
@@ -25,6 +25,8 @@
 #include "cafPdmField.h"
 #include "cafPdmObject.h"
 
+#include <QPointer>
+
 class QImage;
 class RimDockWindowController;
 
@@ -117,8 +119,8 @@ private:
 protected:
     caf::PdmChildField<RimDockWindowController*> m_windowController;
 
-    caf::PdmField<bool>    m_showWindow;
-    ads::CDockWidget*      m_dockWidget;
-    caf::PdmField<QString> m_dockWindowId;
-    bool                   m_isActiveViewer;
+    caf::PdmField<bool>        m_showWindow;
+    QPointer<ads::CDockWidget> m_dockWidget;
+    caf::PdmField<QString>     m_dockWindowId;
+    bool                       m_isActiveViewer;
 };
diff --git a/ApplicationLibCode/UnitTests/RimDockWindowController-Test.cpp b/ApplicationLibCode/UnitTests/RimDockWindowController-Test.cpp
index 5fcc2f9e41..cdc90e1665 100644
--- a/ApplicationLibCode/UnitTests/RimDockWindowController-Test.cpp
+++ b/ApplicationLibCode/UnitTests/RimDockWindowController-Test.cpp
@@ -1,6 +1,11 @@
 #include "gtest/gtest.h"
 
 #include "RimDockWindowController.h"
+#include "RimSummaryPlot.h"
+
+#include "cafPdmDefaultObjectFactory.h"
+
+#include <memory>
 
 //--------------------------------------------------------------------------------------------------
 /// handleViewerDeletion() used to dereference viewPdmObject() (m_viewToControl) unconditionally.
@@ -12,3 +17,32 @@ TEST( RimDockWindowControllerTest, HandleViewerDeletionWithoutViewToControlDoesN
 
     EXPECT_NO_FATAL_FAILURE( controller.handleViewerDeletion() );
 }
+
+//--------------------------------------------------------------------------------------------------
+/// The dock manager identifies dock widgets by the dock window id. Copied views, including plots created from a plot
+/// template, must get a new id, while reading a project (or undoing a delete) must keep it.
+//--------------------------------------------------------------------------------------------------
+TEST( RimDockWindowControllerTest, DockWindowIdIsNotCopied )
+{
+    RimSummaryPlot plot;
+    const QString  dockId = plot.dockWindowName();
+    ASSERT_FALSE( dockId.isEmpty() );
+
+    std::unique_ptr<RimSummaryPlot> copy( plot.copyObject<RimSummaryPlot>() );
+    ASSERT_TRUE( copy );
+    EXPECT_NE( dockId, copy->dockWindowName() );
+
+    const QString xml = plot.writeObjectToXmlString();
+
+    std::unique_ptr<caf::PdmObjectHandle> fromTemplate(
+        caf::PdmXmlObjectHandle::readUnknownObjectFromXmlString( xml, caf::PdmDefaultObjectFactory::instance(), true ) );
+    auto templatePlot = dynamic_cast<RimSummaryPlot*>( fromTemplate.get() );
+    ASSERT_TRUE( templatePlot );
+    EXPECT_NE( dockId, templatePlot->dockWindowName() );
+
+    std::unique_ptr<caf::PdmObjectHandle> fromProject(
+        caf::PdmXmlObjectHandle::readUnknownObjectFromXmlString( xml, caf::PdmDefaultObjectFactory::instance(), false ) );
+    auto projectPlot = dynamic_cast<RimSummaryPlot*>( fromProject.get() );
+    ASSERT_TRUE( projectPlot );
+    EXPECT_EQ( dockId, projectPlot->dockWindowName() );
+}