[NaN, NaN] as a result of passing "Spain" geometry from TopoJSON

[Kamilius]

My task is to calculate center of each given continent/country/state based on topo.json coordinates I have for leaflet.
When I'm calculating this for Canada, US, GB, Sweden or even Italy - everything works great, but when I'm passing "Spain's" coordinates, polylabel returns value of [NaN, NaN].

In which cases polylabel can return this value and what is causing such behavior?

Only thing I've spotted here, is that first and last point is the same. Removing it prior to calculation didn't gave any results.

UPD: This also happens for a few other countries. Looking simply at coordinates is not making any sense for me, as I'm not familiar with polylabel's algorithm and principles yet.

Here is the data I'm trying to calculate center coordinates for:

[[-1.7945079745609398,43.38543254241482],[-1.7485686907125277,43.291246520623524],[-1.6394628915725526,43.25514187893686],[-1.559069144837835,43.284967452504105],[-1.4040240618494515,43.24258374269802],[-1.435607319495233,43.03537449475717],[-1.2748198260257944,43.04636286396616],[-0.9819568914921781,42.95688614326443],[-0.760874087971704,42.945897774055446],[-0.7292908303259189,42.876828024741826],[-0.5627609263754323,42.77322340077141],[-0.3072236599686491,42.83130478087604],[-0.16366339794236495,42.77793270186097],[-0.04020157259976287,42.68531644709953],[0.16939640995861183,42.726130389875756],[0.27563100385806294,42.668049009771124],[0.6431452746453452,42.683746680069675],[0.6575013008479758,42.83758384899546],[0.8125463838363594,42.83130478087604],[0.9216521829763344,42.78421176998039],[1.0680836502431426,42.77636293483111],[1.1341213707752367,42.716711787696624],[1.3178785061688778,42.71357225363692],[1.4298555105493769,42.5958397263978],[1.4068858686251708,42.48595603430796],[1.4470827419925278,42.43415372232275],[1.639453493107748,42.4671188299497],[1.7054912136398421,42.50322347163636],[1.9294452224008403,42.43729325638245],[1.9638996852871493,42.366653740038984],[2.0529070477434423,42.35252583677029],[2.1218159735160604,42.41060721687492],[2.2768610565044476,42.42787465420333],[2.4634893971386127,42.33996770053145],[2.641504122051206,42.3729328081584],[2.934367056584822,42.47025836400941],[3.1812907072700263,42.431014188263035],[3.1726770915484543,42.36351420597927],[3.3191085588152625,42.322700263203046],[3.2616844540047474,42.23950261062074],[3.1525786548647723,42.256770047949146],[3.1209953972189943,42.14060728773988],[3.2128739649158113,42.06839800436656],[3.2358436068400174,41.96636314742599],[3.1927755282321293,41.88787479593324],[3.069313702889527,41.79996784226137],[2.779321973596435,41.646130673335584],[2.4491333709359857,41.53467721421589],[2.2969594931881296,41.46560746490227],[2.1304295892376395,41.30392146082722],[2.0615206634650214,41.274095887259975],[1.538961309689352,41.187758700617955],[1.2173863227504746,41.10456104803564],[1.1858030651046967,41.06217733822956],[0.9905611087489525,41.04020059981159],[0.7149254056584873,40.815723914542346],[0.8728416938873984,40.70740998948236],[0.7838343314311054,40.66188674561656],[0.6000771960374607,40.613223967691056],[0.5483955017080007,40.57241002491483],[0.350282340111729,40.285142658451385],[0.20672207808544485,40.172119432301834],[0.14355556279388182,40.07950317754039],[0.06603302129968824,40.03084039961489],[-0.19524665558814647,39.715317226614054],[-0.3215796861712761,39.515956813822484],[-0.3014812494875976,39.321305702120476],[-0.21534509227182497,39.18159643646339],[-0.209602681790777,39.07799181249297],[-0.12059531933448042,38.950840683074716],[-0.008618314953977801,38.869212797522266],[0.1521691785154573,38.83153838880575],[0.2354341304907024,38.757759338402565],[-0.014360725435029309,38.6243291408649],[-0.0890120616886989,38.53485242016317],[-0.33019330189285157,38.47049197193912],[-0.41345825386809665,38.365317580938836],[-0.5196928477675478,38.299387365684936],[-0.5053368215649172,38.20834087795335],[-0.6087002102238408,38.17851530438611],[-0.6546394940722529,37.99014326080352],[-0.7178060093638159,37.94305024990787],[-0.8527526556685245,37.72328286572819],[-0.7034499831611889,37.61967824175776],[-0.9245327866816666,37.55531779353371],[-1.0680930487079472,37.58200383304124],[-1.1657140268858193,37.54432942432473],[-1.3236303151147304,37.563166628682986],[-1.470061782381542,37.483108510160385],[-1.487289013824693,37.43287596520503],[-1.6710461492183377,37.363806215891415],[-1.8117352060040943,37.20682951290592],[-1.8978713632198634,36.94938772000972],[-2.1275677824619166,36.73589940394945],[-2.20509032395611,36.73746917097931],[-2.3630066121850213,36.83636449386017],[-2.57547579998392,36.811248221382485],[-2.658740751959165,36.69508546117322],[-2.756361730137037,36.68095755790453],[-2.9315052498091028,36.751597074248],[-2.9860581493790903,36.73746917097931],[-3.227239389583243,36.75473660830771],[-3.4138677302174116,36.69508546117322],[-3.6004960708515803,36.74217847206887],[-3.729700306675234,36.724911034740465],[-3.838806105815209,36.751597074248],[-3.9622679311578146,36.72648080177032],[-4.057017704095159,36.746887773158434],[-4.226418813286173,36.71235289850163],[-4.4331455906040205,36.71078313147177],[-4.525024158300845,36.580492467993814],[-4.723137319897113,36.492585514321945],[-4.90402325005023,36.50671341759063],[-4.99590181774705,36.45648087263528],[-5.185401363621747,36.41095762876949],[-5.334704036129079,36.18805071053009],[-5.337575241369606,36.14095769963444],[-5.357673678053285,36.14095769963444],[-5.438067424788002,36.161364671022554],[-5.446681040509581,36.057760047052135],[-5.610339739219544,36.00752750209678],[-5.796968079853709,36.08601585358952],[-5.917558699955787,36.18491117647038],[-6.038149320057865,36.18962047755994],[-6.158739940159943,36.304213470739356],[-6.2190352502109825,36.40310879362021],[-6.2333912764136095,36.57578316690425],[-6.394178769883048,36.637004081068596],[-6.431504438009881,36.751597074248],[-6.359724306996739,36.78613194890481],[-6.500413363782499,36.9603760892187],[-6.744465809227179,37.101655121905644],[-7.02871512803922,37.20525974587606],[-7.413456630269657,37.192701609637226],[-7.4766231455612235,37.494096879369366],[-7.5283048398906836,37.56630616274269],[-7.42494145123176,37.74996890523572],[-7.335934088775463,37.81275958642991],[-7.269896368243376,37.94932931802729],[-7.123464900976565,38.04037580575888],[-7.022972717558169,38.021538601400614],[-6.948321381304499,38.197352508744366],[-7.126336106217092,38.19107344062495],[-7.166532979584449,38.2727013261774],[-7.358903730699669,38.44537569946144],[-7.269896368243376,38.73735236701445],[-7.05455597520395,38.855084894253565],[-7.066040796166053,38.90374767217907],[-6.974162228469233,39.01363136426892],[-7.037328743760796,39.10938715309006],[-7.166532979584449,39.11409645417963],[-7.244055521078643,39.19572433973208],[-7.249797931559694,39.27107315716512],[-7.327320473053888,39.34171267350859],[-7.312964446851261,39.45787543371785],[-7.39910060406703,39.493980075404515],[-7.5168200189285805,39.59287539828537],[-7.557016892295941,39.67921258492739],[-7.341676499256515,39.671363749778116],[-7.034457538520272,39.69020095413638],[-7.002874280874487,39.80322418028593],[-6.925351739380297,39.87229392959955],[-6.8794124555318845,40.008863661196926],[-7.043071154241847,40.181538034480965],[-6.896639686975039,40.25531708488414],[-6.796147503556639,40.355782174794854],[-6.8564428136076785,40.44211936143687],[-6.813374734999794,40.64775884234787],[-6.836344376924,40.84084018702002],[-6.942578970823451,41.01665409436377],[-6.8191171454808455,41.054328503080285],[-6.646844831049307,41.267816819140556],[-6.563579879074062,41.27095635320026],[-6.319527433629382,41.420084221036475],[-6.2046792240083555,41.57078185590255],[-6.365466717477791,41.66339811066399],[-6.554966263352487,41.67438647987297],[-6.577935905276689,41.73874692809702],[-6.523383005706702,41.86746782454513],[-6.655458446770883,41.93339803979903],[-7.051684769963426,41.941246874948305],[-7.143563337660247,41.988339885843956],[-7.249797931559694,41.86432829048542],[-7.588600149941723,41.82508411473904],[-7.723546796246428,41.898863165142224],[-8.047992988425829,41.81723527958977],[-8.18006842949001,41.81095621147035],[-8.23175012381947,41.88630502890339],[-8.108288298476868,42.01031662426192],[-8.191553250452113,42.06211893624713],[-8.220265302857367,42.15316542397872],[-8.346598333440497,42.10136311199351],[-8.625105241771486,42.05113056703815],[-8.751438272354616,41.96950268148569],[-8.877771302937745,41.9067120002915],[-8.897869739621424,42.10293287902336],[-8.843316840051436,42.1641537931877],[-8.757180682835667,42.40746768281521],[-8.866286481975642,42.415316517964484],[-8.823218403367758,42.56915368689027],[-8.903612150102475,42.62566529996504],[-8.969649870634566,42.5785722890694],[-9.070142054052965,42.5958397263978],[-9.029945180685605,42.7072931855175],[-9.11321013266085,42.76537456562213],[-9.141922185066104,42.92235126860762],[-9.225187137041349,42.93961870593603],[-9.251027984206079,43.016537290398915],[-9.216573521319773,43.15467678902615],[-9.05291482260981,43.19706049883223],[-8.969649870634566,43.286537219533955],[-8.843316840051436,43.33833953151917],[-8.6940141675441,43.29281628765338],[-8.507385826909935,43.33049069636989],[-8.444219311618369,43.37601394023569],[-8.214522892376316,43.42467671816119],[-8.33224230723787,43.47176972905684],[-8.309272665313664,43.54554877946002],[-8.085318656552662,43.657002238579715],[-8.059477809387932,43.70880455056493],[-7.775228490575891,43.743339425221734],[-7.542660866093314,43.7307812889829],[-7.3675173464212484,43.68054874402754],[-7.229699494876016,43.56909528490784],[-6.770306656391909,43.56909528490784],[-6.649716036289831,43.58008365411683],[-6.509026979504075,43.54711854648987],[-6.22190645545151,43.59578132441537],[-6.069732577703647,43.56909528490784],[-5.906073878993684,43.587932489266095],[-5.854392184664224,43.66328130669913],[-5.707960717397416,43.56909528490784],[-5.423711398585375,43.56124644975856],[-5.179658953140695,43.48903716638524],[-4.837985529518139,43.44979299063887],[-4.734622140859216,43.41682788301191],[-4.4331455906040205,43.40269997974322],[-4.18909314515934,43.40583951380293],[-3.827321284853106,43.49688600153451],[-3.718215485713131,43.48275809826582],[-3.5545567870031682,43.51729297292263],[-3.3908980882932056,43.42467671816119],[-3.11239117996222,43.35403720181772],[-2.9286340445685752,43.43723485440003],[-2.756361730137037,43.44979299063887],[-2.4835972322870994,43.371304639146125],[-2.368749022666073,43.31479302607134],[-2.098855730056659,43.30380465686236],[-1.7945079745609398,43.38543254241482]]

[Kamilius]

My bad. Seems working, when it is not an "array of arrays", but "array of array of arrays"

[mourner]

Yes, since input is a polygon with an outer ring and holes.