1 files changed, 4 insertions, 0 deletions
diff --git a/src/model/graph.js b/src/model/graph.js
index 160a8dfe..b8d47810 100644
--- a/src/model/graph.js
+++ b/src/model/graph.js
@@ -472,6 +472,10 @@ function Graph(el) {
     }
 
     var findNodeByName = function(name, state) {
+        if (undefined == state){
+            state = null;
+        }
+
         for (var i = 0 ; i < nodes.length ; ++i) {
             if (compareNames(nodes[i].name, name) || nodes[i].state === state) {
                 return nodes[i];