More questions:
Can you also please try same UPDATE statement with another client (you may copy it from HISTORY tab in SQLyog). What happens?
Also does the UPDATE succeed or not?
Is the table ‘parent’ in a Foreign Key setup?
Does it help to “OPTIMIZE TABLE `hatch_summary`;”?
We need not only the table structure, but a full testcase (struture, data and statement/instruction (screenshot is a good thing here) on how you use GUI) where it is reproducible.
But as asked by Sibin, please elaborate the exact meaning of the term “crash” as you experience it here. If there is a crash-dump, please attach it.