Index: gtk2_ardour/lv2_plugin_ui.cc
===================================================================
--- gtk2_ardour/lv2_plugin_ui.cc	(revision 11757)
+++ gtk2_ardour/lv2_plugin_ui.cc	(working copy)
@@ -68,8 +68,9 @@
                          const void* buffer)
 {
 	LV2PluginUI* me = (LV2PluginUI*)controller;
-	suil_instance_port_event((SuilInstance*)me->_inst,
-	                         port_index, buffer_size, format, buffer);
+	if (me->_inst)
+	        suil_instance_port_event((SuilInstance*)me->_inst,
+					 port_index, buffer_size, format, buffer);
 }
 
 void