It was like this before version 0.3 now it treats no value as 0.
Well i cant do anything about corrupted girlsx files
. What kind of error did it throw? Did you get it to work?
The reason i thought it was a problem with blank values was bc the error it was showing was something along the lines of class java.lang.nullpointerexception.null and i know nothing of java so all that stuck out to me was the null bit, but it also showed the name of the bad file so i helped point me in the right direction. it then show a second popup saying polip screwed something up.

here is a corrupted file for testing if you want