Crash when renaming index fields

HeidiSQL 9.3.0.5124 (portable version) crashes when I'm executing my change(s) of the index names in one particular table, eg. (copied from bottom console window): ALTER TABLE a_station_basin DROP INDEX STATION_ID, ADD INDEX IDX_ASB_STATION_ID (STATION_ID), DROP INDEX BASIN_ID, ADD INDEX IDX_ASB_BASIN_ID (BASIN_ID); SELECT DEFAULT_COLLATION_NAME FROM information_schema.SCHEMATA WHERE SCHEMA_NAME='db-dev';