diff --git a/src/displaystatetracker.c b/src/displaystatetracker.c
index fc9109e..ebe1105 100644
--- a/src/displaystatetracker.c
+++ b/src/displaystatetracker.c
@@ -62,7 +62,7 @@ G_DEFINE_TYPE (DisplayStateTracker, display_state_tracker, G_TYPE_OBJECT)
 
 static DisplayStateTracker *_display_state_tracker;
 
-static void
+void
 monitor_free (Monitor *monitor)
 {
   g_free (monitor->connector);
@@ -71,6 +71,19 @@ monitor_free (Monitor *monitor)
   g_free (monitor);
 }
 
+Monitor *
+monitor_dup (Monitor *monitor)
+{
+  Monitor *new_monitor;
+
+  new_monitor = g_new0 (Monitor, 1);
+  new_monitor->connector = g_strdup (monitor->connector);
+  new_monitor->match_string = g_strdup (monitor->match_string);
+  new_monitor->display_name = g_strdup (monitor->display_name);
+
+  return new_monitor;
+}
+
 const char *
 monitor_get_connector (Monitor *monitor)
 {
diff --git a/src/displaystatetracker.h b/src/displaystatetracker.h
index 1c3a7dc..e438dda 100644
--- a/src/displaystatetracker.h
+++ b/src/displaystatetracker.h
@@ -26,6 +26,10 @@ typedef struct _LogicalMonitor LogicalMonitor;
 G_DECLARE_FINAL_TYPE (DisplayStateTracker, display_state_tracker,
                       DISPLAY, STATE_TRACKER, GObject)
 
+void monitor_free (Monitor *monitor);
+
+Monitor * monitor_dup (Monitor *monitor);
+
 const char * monitor_get_connector (Monitor *monitor);
 
 const char * monitor_get_match_string (Monitor *monitor);
diff --git a/src/screencast.c b/src/screencast.c
index 0a15033..724ffc9 100644
--- a/src/screencast.c
+++ b/src/screencast.c
@@ -469,6 +469,22 @@ find_best_window_by_app_id_and_title (const char *app_id,
   return best_match;
 }
 
+void
+screen_cast_stream_info_free (ScreenCastStreamInfo *info)
+{
+  switch (info->type)
+    {
+    case SCREEN_CAST_SOURCE_TYPE_MONITOR:
+      g_clear_pointer (&info->data.monitor, monitor_free);
+      break;
+    case SCREEN_CAST_SOURCE_TYPE_WINDOW:
+      g_clear_pointer (&info->data.window, window_free);
+      break;
+    }
+
+  g_free (info);
+}
+
 static gboolean
 restore_stream_from_data (ScreenCastSession *screen_cast_session)
 
@@ -486,7 +502,8 @@ restore_stream_from_data (ScreenCastSession *screen_cast_session)
   if (!screen_cast_session->restored.data)
     return FALSE;
 
-  streams = g_ptr_array_new_with_free_func (g_free);
+  streams =
+    g_ptr_array_new_with_free_func ((GDestroyNotify) screen_cast_stream_info_free);
 
   g_variant_get (screen_cast_session->restored.data,
                  RESTORE_VARIANT_TYPE,
@@ -512,7 +529,7 @@ restore_stream_from_data (ScreenCastSession *screen_cast_session)
 
             info = g_new0 (ScreenCastStreamInfo, 1);
             info->type = SCREEN_CAST_SOURCE_TYPE_MONITOR;
-            info->data.monitor = monitor;
+            info->data.monitor = monitor_dup (monitor);
             info->id = id;
             g_ptr_array_add (streams, info);
           }
@@ -537,7 +554,7 @@ restore_stream_from_data (ScreenCastSession *screen_cast_session)
 
             info = g_new0 (ScreenCastStreamInfo, 1);
             info->type = SCREEN_CAST_SOURCE_TYPE_WINDOW;
-            info->data.window = window;
+            info->data.window = window_dup (window);
             info->id = id;
             g_ptr_array_add (streams, info);
           }
diff --git a/src/screencast.h b/src/screencast.h
index 3d64b4a..ae8988d 100644
--- a/src/screencast.h
+++ b/src/screencast.h
@@ -64,3 +64,5 @@ typedef struct
 
 gboolean screen_cast_init (GDBusConnection *connection,
                            GError **error);
+
+void screen_cast_stream_info_free (ScreenCastStreamInfo *info);
diff --git a/src/screencastwidget.c b/src/screencastwidget.c
index 11743f7..a40c824 100644
--- a/src/screencastwidget.c
+++ b/src/screencastwidget.c
@@ -101,9 +101,10 @@ create_window_widget (Window *window)
   gtk_widget_set_margin_bottom (window_label, 12);
   gtk_box_append (GTK_BOX (window_widget), window_label);
 
-  g_object_set_qdata (G_OBJECT (window_widget),
-                      quark_window_widget_data,
-                      window);
+  g_object_set_qdata_full (G_OBJECT (window_widget),
+                           quark_window_widget_data,
+                           window_dup (window),
+                           (GDestroyNotify) window_free);
   return window_widget;
 }
 
@@ -123,9 +124,12 @@ create_monitor_widget (LogicalMonitor *logical_monitor)
       GtkWidget *monitor_label;
 
       if (!l->prev)
-        g_object_set_qdata (G_OBJECT (monitor_widget),
-                            quark_monitor_widget_data,
-                            monitor);
+        {
+          g_object_set_qdata_full (G_OBJECT (monitor_widget),
+                                   quark_monitor_widget_data,
+                                   monitor_dup (monitor),
+                                   (GDestroyNotify) monitor_free);
+        }
 
       monitor_label = gtk_label_new (monitor_get_display_name (monitor));
       gtk_widget_set_margin_top (monitor_label, 12);
@@ -599,7 +603,8 @@ screen_cast_widget_get_selected_streams (ScreenCastWidget *self)
   uint32_t id = 0;
   GList *l;
 
-  streams = g_ptr_array_new_with_free_func (g_free);
+  streams =
+    g_ptr_array_new_with_free_func ((GDestroyNotify) screen_cast_stream_info_free);
 
   selected_monitor_rows =
     gtk_list_box_get_selected_rows (GTK_LIST_BOX (self->monitor_list));
@@ -619,7 +624,7 @@ screen_cast_widget_get_selected_streams (ScreenCastWidget *self)
 
       info = g_new0 (ScreenCastStreamInfo, 1);
       info->type = SCREEN_CAST_SOURCE_TYPE_MONITOR;
-      info->data.monitor = monitor;
+      info->data.monitor = monitor_dup (monitor);
       info->id = id++;
       g_ptr_array_add (streams, info);
     }
@@ -634,7 +639,7 @@ screen_cast_widget_get_selected_streams (ScreenCastWidget *self)
 
       info = g_new0 (ScreenCastStreamInfo, 1);
       info->type = SCREEN_CAST_SOURCE_TYPE_WINDOW;
-      info->data.window = window;
+      info->data.window = window_dup (window);
       info->id = id++;
       g_ptr_array_add (streams, info);
     }
diff --git a/src/shellintrospect.c b/src/shellintrospect.c
index 8a81086..d1bcc8c 100644
--- a/src/shellintrospect.c
+++ b/src/shellintrospect.c
@@ -62,7 +62,7 @@ static guint signals[N_SIGNALS];
 
 static ShellIntrospect *_shell_introspect;
 
-static void
+void
 window_free (Window *window)
 {
   g_free (window->title);
@@ -70,6 +70,19 @@ window_free (Window *window)
   g_free (window);
 }
 
+Window *
+window_dup (Window *window)
+{
+  Window *new_window;
+
+  new_window = g_new0 (Window, 1);
+  new_window->id = window->id;
+  new_window->title = g_strdup (window->title);
+  new_window->app_id = g_strdup (window->app_id);
+
+  return new_window;
+}
+
 static void
 get_windows_cb (GObject *source_object,
                 GAsyncResult *res,
diff --git a/src/shellintrospect.h b/src/shellintrospect.h
index f63ecee..ea4188f 100644
--- a/src/shellintrospect.h
+++ b/src/shellintrospect.h
@@ -34,6 +34,10 @@ void shell_introspect_ref_listeners (ShellIntrospect *shell_introspect);
 
 void shell_introspect_unref_listeners (ShellIntrospect *shell_introspect);
 
+void window_free (Window *window);
+
+Window * window_dup (Window *window);
+
 const char * window_get_app_id (Window *window);
 
 const char * window_get_title (Window *window);