If your game tends to crash when you try to save it, try the following:
1) Locate the file sword1.ini in the game's folder and open it. Modify the savepath parameter to contain the game's folder in quotation marks, for instance:
savepath="C:Program Files (x86)GOG.comBroken Sword - The Shadow of the Templars"
2) If adding the quotation marks doesn't help, reinstall the game to a folder whose name doesn't contain any spaces, for instance:
3) If none of the above helps, add Broken Sword to ScummVM manually