I've seen other comments about FileMaker Pro 13 crashing because is not compatible with High Sierra. This appears very strange to me, as I've been running High Sierra for several months without any problems using FileMaker Pro 13. My crashes just began yesterday (4 Jan 2018), no problems existed before.
I expected to see a fix better than reverting to an older version of MacOS or paying out $$$ to upgrade to FileMaker Pro 16. I've only had FileMaker Pro 13 for just over 2 years and I expect it to last longer than 2 years. To me the resolution should be working with Apple and their new releases to ensure that the older versions continue to operate as designed.