Information:I added the latest version of the mod to my modpack, and when I tried it I opened the guide and the game crashed.

Link:https://paste.dimdev.org/udikecogaw.mccrash

With me the SecurityCraft Manual worked well in 1.12.2 (and I hoped you meant it with "Guide"), so could you please send the list of the mods you used? Also, could you please describe a bit more how and when the crash occured (opening the manual, clicking on one of the arrows, hovering over the middle bar, etc.)?

@RedstoneDubstep He is using the Spanish language, you probably tested it with English which doesn't have that bug.
@SoyJetixXD Fixed in da35577 which means the fix will be released with v1.8.18. Thanks for reporting!