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-rw-r--r--gtk/gtkcssnode.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/gtk/gtkcssnode.c b/gtk/gtkcssnode.c
index ab52c2bcd3..ebc65a8d43 100644
--- a/gtk/gtkcssnode.c
+++ b/gtk/gtkcssnode.c
@@ -1353,6 +1353,8 @@ gtk_css_node_validate (GtkCssNode *cssnode)
gint64 timestamp;
gint64 before = g_get_monotonic_time ();
+ g_assert (cssnode->parent == NULL);
+
timestamp = gtk_css_node_get_timestamp (cssnode);
gtk_css_node_validate_internal (cssnode, &filter, timestamp);