void (@NotNull final XCompositeNode node) { if (node.isObsolete()) return; if (myReferrersLoader == null) { LOG.error("Failed to load Referring Objects. Frame accessor: " + getFrameAccessor()); return; } myReferrersLoader.loadReferrers(this, new PyDebugCallback<>() { @Override public void ok(XValueChildrenList value) { if (!node.isObsolete()) { node.addChildren(value, true); } } @Override public void error(PyDebuggerException e) { if (!node.isObsolete()) { node.setErrorMessage("Unable to display children:" + e.getMessage()); } LOG.warn(e); } }); }