I liked to add a new function to ‘EarTest_08T4.asm’ (the name is not important). So, after I opened it, I saved it with another name as 'EarTest_08T5.asm'. Then, without doing anything else, I closed/exited simulIDE. A crash occurred.
I repeated these few steps several times and I got a crash always.
I hope this can be reproduced on your side.
(You may like to open ‘EarTest_08P_.asm’, you have already, and rename it as ‘EarTest_08PP.asm’ for example, then exit the program).