Stop the physics simulation in neovis.js

Neo4j Graph Platform Visualization
1

I draw correctly the graph using neovis.js, but I want to stop the physics simulation. Reading the documentation, I tried to use the method stabilize() in this way

let content = new NeoVis.default(config);
content.render();
content.stabilize();

But I recieve this error:

Cannot read property 'stopSimulation' of null

What's wrong?