IE11: Script error occurs when search from OpenSearch dashlet is being performed

Steps to reproduce:

1. Log into the Alfresco Explorer as any user
2. Add OpenSearch dashlet to My Alfresco dashboard
3. Enter any string into the Search field
4. Check any of the 'Current Alfresco People' or 'Current Alfresco Repository' check-boxes (or both of them)
5. Perform search

Observed result: Script error message is displayed twice on the page. Please, see the attached screenshot screen1.png. Search isn't performed. Search result aren't returned. No errors appear to the logs.

Expected result: Search should be performed without errors. Search results should be returned.

ChristinaSh