sidenav getMenuItem error

Classic Servoy
1

I’m setting the sidenav objects by form variable like:

var fv_sidenavmenu_media = [
		{
			// Contacts
			id: 1,
			text: "i18n:cuvis.navitem.text.lc.contacts",
			styleClass: "svy-sidenav",
			iconStyleClass: "fa fa-address-card-o",
			onAction: "",
			data: {formName:'', listName:'', tabPanel:'', updateMenu:'true'},
			menuItems: [{
							id: 1.1,
							text: "i18n:cuvis.navitem.text.lc.customer",
							data: {formName:'lst_contacts'}
						}, {
							id: 1.2,
							text: "i18n:cuvis.navitem.text.lc.other",
							data: {formName:'lst_contacts'}
						}, {
							id: 1.3,
							text: "i18n:cuvis.navitem.text.lc.contact_persons",
							data: {formName:'lst_contacts'}
						}],
			enabled: true
		}, {
			isDivider: true, styleClass:'svy-sidenav-divider'
		}, {
			// Calendar
			id: 2,
			text: "i18n:cuvis.navitem.text.lc.schedule",
			styleClass: "svy-sidenav",
			iconStyleClass: "fa fa-calendar",
			onAction: "",
			data: {formName:'dtl_calendar', updateMenu:'true'},
			enabled: true
		}, ...

At this point of the onMenuItemSelected function

 * @param {Object} menuItemId
...
var _item = elements.sidenav_1.getMenuItem(menuItemId);

I get the error:

"<error printing evaluated value in debugger:
value class: com.servoy.j2db.server.ngclient.component.RhinoMapOrArrayWrapper
value.toString() is: RhinoMapOrArrayWrapper: #CAM# {onAction=, data={updateMenu=true, formName=, listName=, tabPanel=}, menuItems=#CAL# [#CAM# {data={formName=lst_contacts}, id=1.1, text=com.servoy.j2db.server.ngclient.property.types.BasicI18NTagStringTypeSabloValue@869fb969}, #CAM# {data={formName=lst_others}, id=1.2, text=com.servoy.j2db.server.ngclient.property.types.BasicI18NTagStringTypeSabloValue@601532d4}, #CAM# {data={formName=lst_contact_persons}, id=1.3, text=com.servoy.j2db.server.ngclient.property.types.BasicI18NTagStringTypeSabloValue@6a162246}], id=1.0, text=com.servoy.j2db.server.ngclient.property.types.BasicI18NTagStringTypeSabloValue@21114965, styleClass=svy-sidenav, iconStyleClass=fa fa-address-card-o, enabled=true}

Exception: null
java.lang.NullPointerException
	at com.servoy.j2db.server.ngclient.component.RhinoMapOrArrayWrapper.getIds(RhinoMapOrArrayWrapper.java:322)
	at org.eclipse.dltk.rhino.dbgp.DBGPDebugger.createChilds(DBGPDebugger.java:425)
	at org.eclipse.dltk.rhino.dbgp.DBGPDebugger.printProperty(DBGPDebugger.java:290)
	at org.eclipse.dltk.rhino.dbgp.DBGPDebugger.printProperty(DBGPDebugger.java:214)
	at org.eclipse.dltk.rhino.dbgp.ContextGetCommand.parseAndExecute(ContextGetCommand.java:70)
	at org.eclipse.dltk.rhino.dbgp.DBGPDebugger.executeCommand(DBGPDebugger.java:571)
	at org.eclipse.dltk.rhino.dbgp.DBGPDebugger.access$0(DBGPDebugger.java:535)
	at org.eclipse.dltk.rhino.dbgp.DBGPDebugger$2.run(DBGPDebugger.java:513)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
>"

What goes wrong? Does anybody can help?

Servoy Version: 2019.3.1.3413
Java Version 8 Update 211

2

It seems the “<error printing evaluated value in debugger:…” occurs only if I have set breakpoints in the debugger.
I don’t get an error in the NG Client of the Developer (without the breakpoints for debugging).