We updated to Forms 11 update 5 on 2/21/24 and we have a Team javascript filter that errors out with the following error:

Filter returned a script error: Cannot read property 'toLowerCase' of null [LFF6010-FilterReturnedScriptError]

Details:
URL: 
Error: FilterReturnedScriptError
Date: 2/22/2024 4:11:50 PM (Mountain Standard Time)
HTTP Status Code: 500
Business Process ID: 4
Instance ID: 76793
Business Process Name: Medicaid Appeal Workflow

Other:
TeamFilter: 6

Stack Trace:
Caught exception: Laserfiche.Forms.CommonUtils.Exceptions.LFFormsException
Message: Filter returned a script error: Cannot read property 'toLowerCase' of null [LFF6010-FilterReturnedScriptError]
   at Laserfiche.Forms.CommonUtils.RuleExecutionService.ExecuteTeamScriptFilter(IEntityContext appContext, team team, business_rule rule, cf_bp_main_instances mainInstance, cf_bp_processes process, XmlDocument routingXml, String& TestValue)
   at Laserfiche.Forms.Routing.UserTask.ResolveAndAssignTeamMemberToTask(cf_bp_worker_instnc_to_resume wr, IRoutingContext routingContext)

Here is the filter that has been working for years:

So testing the script with a blank value for 'Appeals_Coordinator' should return all team members which it does.  But when the script runs in the business process, the instance suspends with the error.  

I don't know where the property 'toLowerCase' is coming from or if the script is now evaluating the blank variable as NULL.