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-rw-r--r--gtk/gtkcssstyle.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/gtk/gtkcssstyle.c b/gtk/gtkcssstyle.c
index 040998b6cb..084919159e 100644
--- a/gtk/gtkcssstyle.c
+++ b/gtk/gtkcssstyle.c
@@ -82,6 +82,9 @@ gtk_css_style_get_difference (GtkCssStyle *style,
GtkBitmask *result;
guint i, len;
+ if (style == other)
+ return _gtk_bitmask_new ();
+
result = _gtk_bitmask_new ();
len = _gtk_css_style_property_get_n_properties ();
for (i = 0; i < len; i++)