Copy Custom Field script from Scriptrunner throwing error

[Deleted user]

Trying to copy the data from a single user custom field to a multi user custom field fails with a java error.  The preview works fine but when you press Run you get:

Error

com.atlassian.jira.user.DelegatingApplicationUser cannot be cast to java.util.Collection

java.lang.ClassCastException: com.atlassian.jira.user.DelegatingApplicationUser cannot be cast to java.util.Collection at com.atlassian.jira.issue.customfields.impl.MultiUserCFType.updateValue(MultiUserCFType.java:73) at com.atlassian.jira.issue.fields.CustomFieldImpl.updateValue(CustomFieldImpl.java:526) at com.atlassian.jira.issue.fields.CustomFieldImpl.updateValue(CustomFieldImpl.java:487) at com.atlassian.jira.issue.fields.OrderableField$updateValue.call(Unknown Source) at com.onresolve.scriptrunner.canned.jira.admin.CopyCustomField.doScript(CopyCustomField.groovy:203)

I updated Scriptrunner to 3.0.16 and got the same error.  What else can I try?

Thanks

[Chirag Thaker]

We are observing the same issue