fix handling of ticks parameter

docs/changelog.txt

@@ -29,8 +29,6 @@ Template for new versions:
 ## New Features
 
 ## Fixes
-- `tailor`: remove crash caused by clothing items with an invalid ``maker_race``
-- `seedwatch`: seedwatch will now ignore (unplantable) tree seeds entirely
 
 ## Misc Improvements
 
@@ -64,6 +62,9 @@ Template for new versions:
 - Core: fix text getting added to DFHack text entry widgets when Alt- or Ctrl- keys are hit
 - `orders`: prevent import/export overlay from appearing on the create workorder screen
 - `caravan`: corrected prices for cages that have units inside of them
+- `tailor`: remove crash caused by clothing items with an invalid ``maker_race``
+- `seedwatch`: seedwatch will now ignore (unplantable) tree seeds entirely
+- `autobutcher`: fix ``ticks`` commandline option incorrectly rejecting positive integers as valid values
 
 ## Misc Improvements
 - Surround DFHack-specific UI elements with square brackets instead of red-yellow blocks for better readability

plugins/lua/autobutcher.lua

@@ -19,7 +19,7 @@ end
 local function process_args(opts, args)
     if args[1] == 'help' then
         opts.help = true
-        return
+        return {}
     end
 
     return argparse.processArgsGetopt(args, {
@@ -67,7 +67,7 @@ function parse_commandline(opts, ...)
         process_races(opts, positionals, 6)
     elseif command == 'ticks' then
         local ticks = tonumber(positionals[2])
-        if not is_positive_int(arg) then
+        if not is_positive_int(ticks) then
             qerror('number of ticks must be a positive integer: ' .. ticks)
         else
             opts.ticks = ticks