Don't call the gsignal functions after the library has been unloaded.

generated/gtkd/gtk/Container.d

@@ -277,8 +277,15 @@ public class Container : Widget
 	{
 		children = null; //Is this needed?
 
+		import std.traits : isPointer;
+		import gtkd.Loader;
 		import gobject.c.functions;
 		import glib.c.functions;
+
+		static if ( isPointer!(typeof(g_signal_handlers_disconnect_matched)) )
+			if ( !Linker.isLoaded(LIBRARY_GOBJECT) )
+			return;
+
 		g_signal_handlers_disconnect_matched(gtkContainer, GSignalMatchType.FUNC, 0, g_quark_from_string("add"), null, &gtkd_container_add, null);
 		g_signal_handlers_disconnect_matched(gtkContainer, GSignalMatchType.FUNC, 0, g_quark_from_string("remove"), null, &gtkd_container_remove, null);
 	}

src/APILookupGtk.txt

@@ -1054,8 +1054,15 @@ code: start
 	{
 		children = null; //Is this needed?
 
+		import std.traits : isPointer;
+		import gtkd.Loader;
 		import gobject.c.functions;
 		import glib.c.functions;
+
+		static if ( isPointer!(typeof(g_signal_handlers_disconnect_matched)) )
+			if ( !Linker.isLoaded(LIBRARY_GOBJECT) )
+				return;
+
 		g_signal_handlers_disconnect_matched(gtkContainer, GSignalMatchType.FUNC, 0, g_quark_from_string("add"), null, &gtkd_container_add, null);
 		g_signal_handlers_disconnect_matched(gtkContainer, GSignalMatchType.FUNC, 0, g_quark_from_string("remove"), null, &gtkd_container_remove, null);
 	}