Error at CommunicationEventServices.groovy:489 due to OFBIZ-11167

I get this error locally:

The Following Errors Occurred:

Service dispatcher threw an exception:Error running Groovy method [sendEmailDated] in Groovy file [component://party/groovyScripts/communication/CommunicationEventServices.groovy]: (Cannot cast object '[]' with class 'java.util.ArrayList' to class 'java.util.Map' due to: groovy.lang.GroovyRuntimeException: Could not find matching constructor for: java.util.Map())

When I replace
Map sendEmailDated() {
by
def sendEmailDated() {
The error disappears

I guess something better can be done, but I have not yet found what