From e1ab8db88d76bf10af4914a9cd1ea8e020f84ce1 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Sun, 8 Dec 2019 13:08:30 -0500
Subject: [PATCH] filter: Add a missing precondition

---
 gtk/gtkfilters.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gtk/gtkfilters.c b/gtk/gtkfilters.c
index 9a0157b466..01dc740248 100644
--- a/gtk/gtkfilters.c
+++ b/gtk/gtkfilters.c
@@ -255,6 +255,8 @@ gtk_any_filter_remove (GtkAnyFilter *self,
   GSequenceIter *iter;
   guint length;
 
+  g_return_if_fail (GTK_IS_ANY_FILTER (self));
+
   length = g_sequence_get_length (self->filters);
   if (position >= length)
     return;