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-rw-r--r--gio/gapplication.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/gio/gapplication.c b/gio/gapplication.c
index d0b37b6e2..cbc467a92 100644
--- a/gio/gapplication.c
+++ b/gio/gapplication.c
@@ -2832,6 +2832,8 @@ g_application_quit (GApplication *application)
*
* To cancel the busy indication, use g_application_unmark_busy().
*
+ * The application must be registered before calling this function.
+ *
* Since: 2.38
**/
void
@@ -2840,6 +2842,7 @@ g_application_mark_busy (GApplication *application)
gboolean was_busy;
g_return_if_fail (G_IS_APPLICATION (application));
+ g_return_if_fail (application->priv->is_registered);
was_busy = (application->priv->busy_count > 0);
application->priv->busy_count++;