Jira Behaviour,unable to get current selected sprint.

[Muhammad Ramzan_Atlassian Certified Master_]

Dears,

I am using following line of codes in jira behaviour to get the selected sprint in an issue.

def sprintFormField = getFieldById("customfield_10105")
def changedSprint = getFieldById(getFieldChanged())

 Its working fine if the issue was not moved from complete sprint to backlog.

In my case now, 

IssueId=key-1

This issue was in sprint 1, and sprint was complete and this issue move to sprint2.

Now the above code only returning the completed sprint id not the current selected sprint in sprint field.