Index: res/res_xmpp.c
===================================================================
--- res/res_xmpp.c	(revision 374095)
+++ res/res_xmpp.c	(working copy)
@@ -3142,8 +3142,12 @@
 		}
 
 		if ((node && strcmp(resource->caps.node, node)) || (ver && strcmp(resource->caps.version, ver))) {
-			ast_copy_string(resource->caps.node, node, sizeof(resource->caps.node));
-			ast_copy_string(resource->caps.version, ver, sizeof(resource->caps.version));
+			if (node) {
+				ast_copy_string(resource->caps.node, node, sizeof(resource->caps.node));
+			}
+			if (ver) {
+				ast_copy_string(resource->caps.version, ver, sizeof(resource->caps.version));
+			}
 
 			/* Google Talk places the capabilities information directly in presence, so see if it is there */
 			if (iks_find_with_attrib(pak->x, "c", "node", "http://www.google.com/xmpp/client/caps") ||