Solution : https://service.sap.com/sap/support/notes/1394696 (SAP Service marketplace login required)
Key words : 
clicks serveral times fast, kernel patch belonging, exact patch numbers, support packages refer, user works, dynpro screen, html control, webgui page, terms cl_gui_html_viewer, error occures
Related Notes : 
       
| 1233564 | |
| 870373 | ITS HTML Viewer: Documents are not cached. | 
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace |