client/graph: find_node_* returns null on unfound, not undefined. Fixes #275

1 files changed, 1 insertions, 1 deletions

diff --git a/src/client/model/graph.js b/src/client/model/graph.js
index 366d2e17..49ac4c3c 100644
--- a/src/client/model/graph.js
+++ b/src/client/model/graph.js
@@ -421,7 +421,7 @@ function Graph(spec) {
              * handle name update collision: suggest removal first
              */
             var n_eq_name = find_node__by_name(new_node_spec.name);
-            if (undefined !== n_eq_name && n_eq_name !== node) {
+            if (null !== n_eq_name && n_eq_name !== node) {
                 // delete colliding node on rename
                 console.warn('update_node: name collision blocked due to node rename');
                 undefined != on_error && on_error();