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[Benedikt Straub <benedikt-straub@xxxxxx>]

I added some comments and logs.
Normally, the campaign data file should be in "~/.widelands/campaigns/campaign_name/scenario_name.wcd".
I believe the error may be caused by Section::has_val(). The Profile class is used in many places but the has_val() function was unused until now.
I´m unable to run with ASAN for some reason, it compiles fine but I get this error on startup:
==25087==ASan runtime does not come first in initial library list; you should either link runtime to your application or manually preload it with LD_PRELOAD.
Can you please trigger the error again with the additional logs and provide the output, and possibly the contents of the .wcd file (if it exists)?

The easiest way to test is to put the following code in the scripting/init.lua for any map, and load it as a singleplayer scenario:

include "scripting/coroutine.lua"
function thread()
game = wl.Game ()
save()
read()
end
function save()
print("Starting to WRITE...")
game:save_campaign_data("test_campaign", "test_scenario", {
   x = 5,
   y = "Hello",
   z = {
      nil,
      10,
      12,
      14,
      16,
      "A",
      "B",
      "C",
      {
         a = 1,
         b = 2,
      },
      "D",
   }
})
print("Done.")
end
function print_table(t, depth)
   print(string.rep(" ", depth - 1) .. "#=" .. #t)
   for k,v in pairs(t) do
      local string = string.rep(" ", depth) .. k .. "="
      if v == nil then
         print ( string .. "nil" )
      elseif type(v) == "table" then
         print ( string .. "{" )
         print_table(v, depth + 2)
         print (string.rep(" ", depth) .. "}")
      elseif type(v) == "boolean" then
         if v then print ( string .. "true" ) else print ( string .. "false" ) end
      else
         print ( string .. v )
      end
   end
end
function read()
print("Starting to READ...")
local result = game:read_campaign_data("test_campaign", "test_scenario")
print("Returned:")
if result == nil then
   print ("  <nil>")
else
   print_table(result, 2)
end
print("Done.")
end
run(thread)

This saves a campaign data file, then reads it and prints the result to stdout. You can then compare the init.lua, the wcd file and the output. Without ASAN, this works fine for me.
-- 
https://code.launchpad.net/~widelands-dev/widelands/campaign_data/+merge/343783
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