NBTExplorer crashing if the search function is used and then canceled before something is found.

[ArcherLegend]

NBTExplorer crashes if the search function is used and then canceled. Also after failing it creates a lot of .dat duplicates or sometimes even random MCA region files which then need to be manually deleted.
Here is the error log generated by the program.
error.log

As a further suggestion I would ask if it is possible to do something with the code in order to use more of the single core or more cores in order to speed up the search function which does not leverage the cpu thread all that much and is quite slow in executing the search.