Ardour-8.6.0.diff

--- Ardour-8.6.0/libs/surfaces/websockets/message.cc.orig	2024-04-13 16:05:25.000000000 +0100
+++ Ardour-8.6.0/libs/surfaces/websockets/message.cc	2024-04-23 19:52:20.637250268 +0100
@@ -58,14 +58,16 @@
 
 		_state = NodeState (root.get<std::string> ("node"));
 
-		pt::ptree addr = root.get_child ("addr", pt::ptree ());
+		pt::ptree dflt;
+
+		pt::ptree addr = root.get_child ("addr", dflt);
 
 		for (pt::ptree::iterator it = addr.begin (); it != addr.end (); ++it) {
 			// throws if datatype not uint32_t
 			_state.add_addr (boost::lexical_cast<uint32_t> (it->second.data ()));
 		}
 
-		pt::ptree val = root.get_child ("val", pt::ptree ());
+		pt::ptree val = root.get_child ("val", dflt);
 
 		for (pt::ptree::iterator it = val.begin (); it != val.end (); ++it) {
 			std::string val = it->second.data ();