Please check if this issue exists for all the users. If you and most of the others are not facing this issue and only some set of customers are facing this issue, then most likely this issue could be due to lower SAP GUI version and patch level of those customers.
Message_Type_X Dump also occurs when proper date format is not maintained in SU01 transaction of the user who have faced this dump.
please goto SU01 and check the date format in the defaults tab. If there is any date format other than DD.MM.YYYY, please change that to this format to avoid this error.