diff --git a/openwisp_network_topology/templates/netjsongraph/netjsongraph-script.html b/openwisp_network_topology/templates/netjsongraph/netjsongraph-script.html
index 70d32df5..e7e89dcc 100644
--- a/openwisp_network_topology/templates/netjsongraph/netjsongraph-script.html
+++ b/openwisp_network_topology/templates/netjsongraph/netjsongraph-script.html
@@ -40,10 +40,10 @@
             }
         }).then(data => {
             if (data.nodes.length > 20) {
-                grapgConfig.series.force = {
+                graphConfig.series.force = {
                     layoutAnimation: false,
                 };
-                grapgConfig.series.draggable = false;
+                graphConfig.series.draggable = false;
                 if (data.nodes.length > 50) {
                     graphConfig.series.force.edgeLength = 250;
                 }