TFS 1.X+ Npc module onSell error

[Mjmackan]

Anyone aware of whats causing this error?
TFS 1.4
Error:

Lua Script Error: [Npc interface]
(Unknown scriptfile)
data/npc/lib/npcsystem/modules.lua:1023: [ShopModule.onSell] items[itemid] == nil
stack traceback:
        [C]: at 0x7ff623fb7720
        [C]: in function 'error'
        data/npc/lib/npcsystem/modules.lua:1023: in function 'callbackOnSell'
        data/npc/lib/npcsystem/npchandler.lua:264: in function 'processModuleCallback'
        data/npc/lib/npcsystem/npchandler.lua:469: in function 'onSell'
        data/npc/lib/npcsystem/modules.lua:1087: in function <data/npc/lib/npcsystem/modules.lua:1087>

Specific item causing the issue(on sell):

demonbone amulet,14333,10000;

Npc script causing it:

<?xml version="1.0" encoding="UTF-8"?>
<npc name="Hans [Loot whore]" script="default.lua" walkinterval="1000" speed="220" floorchange="0">
    <health now="100" max="100" />
    <look type="908" head="39" body="80" legs="39" feet="80" addons="3" />
    <parameters>
        <parameter key="module_shop" value="1" />
        <parameter key="shop_sellable" value="beetroot,8845,20;bedger fur,11216,500;four-leaf clover,15546,300;acorn,11213,3000;pelvis bone,12437,2500;fish tail,5951,4500;seeds,7732,100;
        turtle shell,5899,5000;fleshy bone,13830,5000;half-digested piece of meat,11200,1500;striped fur,11210,2200;iron ore,5880,6500;dwarven beard,5900,1500;piece of crocodile leather,11196,2000;
        crocodile boots,3982,20000;crocodile steak,11429,5000;sewing kit,21452,6000;elvish talisman,10552,1000;elven poetry book,4855,8000;elvish bow,7438,20000;cyclops toe,10574,1500;giant eye,4630,5000;
        cyclops trophy,7398,8000;bear doll,3954,6000;giant ape's fur,4843,400;kongra's shoulderpad,12427,5000;gemmed lamp,2344,6000;djinns hat,32935,3500;silky fur,11209,5000;wyvern talisman,10561,1000;
        wyvern wing,5894,6000;skull,2229,300;ragnir helmet,7462,3000;ron the ripper's sabre,6101,16000;pirate tapestry,5616,3000;rum flask,5553,3000;pirate's hat,6099,15000;dragon claw,10020,6000;
        dragon's tail,12413,800;green dragon leather,5877,2500;green dragon scale,5920,4000;bog slime,10557,300;boggy dreads,10584,1200;misguided scarf,34886,8000;crit potion,35055,25000;
        light blue egg,24808,1200;light pink egg,34809,2000;dark orange egg,34810,1500;dark purple egg,34811,8800;red dragon leather,5948,600;red dragon scale,5882,2000;dragon lord claw,5919,8000;
        dragon lord trophy,7399,30000;flask of warrior's sweat,5885,1000;piece of warrior armor,12438,3800;broken gladiator shield,10573,8200;sword hilt,2350,32000;behemoth claw,5930,3800;
        perfect behemoth fang,5893,9100;behemoth trophy,7396,40000;half-eaten brain,10587,1000;scythe leg,11229,18000;pulverized ore,18427,2200;vein of ore,18429,11000;icicle,4848,400;humongous chunk,18433,700;
        hideous chunk,18434,700;mucus plug,9130,3000;glowing mushroom,18391,11000;mushroom pie,18397,4000;cobra tongue,10551,9000;wyrm scale,10582,900;hydra tounge,7250,500;hydra head,11199,700;sample of venorean spice,9675,8000;
        hydra egg,4850,13000;frosty heart,10578,600;frost charm,7289,8000;memory stone,4852,3500;soul stone,5809,2500;mago mechanic core,10167,3000;shamanic talisman,24840,6000;mutated rat tail,10585,1000;gooey mass,15572,400;
        gooey substance,15462,4000;slime heart,23565,1000;slime gobbler,13601,15000;bottle of glooth vine,23516,500;glooth steak,23517,5000;glooth capsule,24183,14000;foxtail,15545,3000;werebadger skull,24711,1000;
        werebadger claws,24707,3800;werebadger trophy,24757,11000;werewolf fur,11234,1600;werewolf fangs,24708,5200;werewolf helmet,24718,18000;wereboar hooves,24710,2000;wereboar tusks,24709,6800;wereboar trophy,24758,20000;
        werebear fur,24713,2400;werebear skull,24712,7700;werebear trophy,24759,24000;;demon horn,5954,2000;demon trophy,7393,60000;metal jaw,23564,800;minotaur leather,5878,500;mooh'tah shell,23573,2000;demonbone amulet,14333,10000;
        execowtioner mask,23572,5000;cowbell,23575,8000;moohtant horn,23571,12000;minotaur trophy,7401,34000;grim key,26389,80000;twin sun charm,11261,2000;spark reaving potion,26466,12000;phoenix charm,11258,2800;blazing bone,18425,15000;
        giant pacifier,23570,150000" />
        <parameter key="message_greet" value="Schh not that loud, they arent after you are they? ... good hmm do you got any interesting EQ to sell me |PLAYERNAME|?"/>
        <parameter key="message_farewell" value="Farewell, |PLAYERNAME|, if i only had that key."/>
        <parameter key="message_walkaway" value="Farewell, |PLAYERNAME|, if i only had that key." />   
    </parameters>
</npc>