- ModestHeaderWindow *self = (ModestHeaderWindow *) user_data;
- ModestHeaderWindowPrivate *priv = MODEST_HEADER_WINDOW_GET_PRIVATE (self);
+ ModestHeaderWindow *self;
+ ModestHeaderWindowPrivate *priv;
+
+ self = (ModestHeaderWindow *) user_data;
+ if (!GTK_IS_WIDGET (self))
+ return;
+
+ priv = MODEST_HEADER_WINDOW_GET_PRIVATE (self);