diff --git a/packages/node_modules/@node-red/editor-client/src/js/nodes.js b/packages/node_modules/@node-red/editor-client/src/js/nodes.js
index ab31e5038..052fad558 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/nodes.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/nodes.js
@@ -778,12 +778,13 @@ RED.nodes = (function() {
 
     function moveJunctionToTab(junction, z) {
         var index = junctionsByZ[junction.z].indexOf(junction);
-        junctionsByZ[junction.z].splice(junction,1);
+        junctionsByZ[junction.z].splice(index,1);
         junctionsByZ[z] = junctionsByZ[z] || [];
         junctionsByZ[z].push(junction);
-        junction.z = z;
 
         var oldZ = junction.z;
+        junction.z = z;
+
         var nl = nodeLinks[junction.id];
         if (nl) {
             nl.in.forEach(function(l) {