highcharts-export-server does not finish - node.js

I have highcharts-export-server v2.1.0 (which uses phantomjs v.2.1.1) configured on 2 servers.
Problem: One server can produce a chart from my "test" .json to .svg, the other server cannot / seems stuck...
Question: I have already set the logLevel to 4, How else can I debug this / find the error?
.
My input script is the following:
{"title":{"text":"Benchmark +0.75% (Year to Date)"},"time":{"useUTC":false},"chart":{"alignThresholds":true,"width":1000,"height":400,"plotBackgroundColor":null,"plotBorderWidth":0,"plotShadow":false,"spacingRight":40},"xAxis":{"labels":{"rotation":-45}},"yAxis":[{"labels":{"format":"{value:.0f}"},"showLastLabel":true,"opposite":false,"min":-3.67256505,"max":4.93075599694519,"tickPositions":[-3.67,-2.6,-1.52,0,0.63,1.7,2.78,3.86,4.93]},{"showLastLabel":true,"gridLineWidth":0,"tickPosition":"outside","labels":{"align":"right","x":30,"style":{"color":"#ff0000"}},"min":-0.9340809915870241,"max":1.2540895500000002,"tickPositions":[-0.93,-0.66,-0.39,-0.11,0,0.16,0.43,0.71,0.98,1.25]}],"legend":{"enabled":true},"rangeSelector":{"enabled":false},"scrollbar":{"enabled":false},"navigator":{"enabled":false},"credits":{"enabled":false},"plotOptions":{"series":{"compare":"percent","showInNavigator":false}},"series":[{"compare":"amount","data":[[1609282800000,0],[1609369200000,-0.03428646532872559],[1609455600000,-0.0016039750283303178],[1609714800000,0.7637526405996908],[1609801200000,0.8005732883660022],[1609887600000,-0.1690494144598209],[1609974000000,-0.3809350266101741],[1610060400000,-1.514325071693856],[1610319600000,-0.4765023006985114],[1610406000000,-0.20592306146072215],[1610492400000,-1.6056700749591757],[1610578800000,-2.283907756098269],[1610665200000,-2.8475657141212585],[1610924400000,-2.5301565339659216],[1611010800000,-1.347913879404139],[1611097200000,-1.078254441804205],[1611183600000,-1.508647334728952],[1611270000000,-1.5661224299388987],[1611529200000,-2.280813980426055],[1611615600000,-1.9904069262878465],[1611702000000,-3.1733261828598924],[1611788400000,-2.6038661425901943],[1611874800000,-3.10474672552985],[1612134000000,-1.9489382228070617],[1612220400000,-1.4168123948971045],[1612306800000,-1.5077205238559155],[1612393200000,-1.114743473256452],[1612479600000,-1.445007216058669],[1612738800000,-1.2708019773828516],[1612825200000,-1.5637751417799883],[1612911600000,-0.9207988194119499],[1612998000000,-0.5330477534657541],[1613084400000,-1.3483873661346957],[1613343600000,-1.2824277237734494],[1613430000000,-0.8192853328358063],[1613516400000,-0.3653079990091568],[1613602800000,-0.060653517166342485],[1613689200000,0.8697340876174797],[1613948400000,1.2280953226873725],[1614034800000,1.0859394764373809],[1614121200000,1.2063367293352778],[1614207600000,0.10773414212172927],[1614294000000,-1.5207190905506263],[1614553200000,-0.9816998314673975],[1614639600000,-0.924383129032802],[1614726000000,-0.8715904396361718],[1614812400000,-0.4280745420743859]],"name":"Portfolio -0.43%"},{"compare":"amount","data":[[1609282800000,0],[1609714800000,0.8278755650112268],[1609801200000,0.7356135496841887],[1609887600000,-0.3448445224439989],[1609974000000,-0.5651564695949629],[1610060400000,-1.6946417469431263],[1610319600000,-0.6017716353404978],[1610406000000,-0.302437374178699],[1610492400000,-1.6516136459999498],[1610578800000,-2.459423156169538],[1610665200000,-2.696698045145274],[1610924400000,-2.410809781870449],[1611010800000,-1.3613816021318614],[1611097200000,-0.991919709902811],[1611183600000,-1.414545878781237],[1611270000000,-1.4817771059954743],[1611529200000,-2.3322008861873744],[1611615600000,-2.036590278127237],[1611702000000,-3.4976807891963],[1611788400000,-2.986102839764737],[1611874800000,-3.4540325607614886],[1612134000000,-2.105269707267987],[1612220400000,-1.5899676921416361],[1612306800000,-1.7726301025414615],[1612393200000,-1.5556279775712611],[1612479600000,-1.7695269895245613],[1612738800000,-1.655544008265486],[1612825200000,-1.93170951416185],[1612911600000,-1.2587762893416121],[1612998000000,-0.8789710996493616],[1613084400000,-1.718017623965562],[1613343600000,-1.6160328512600741],[1613430000000,-1.1553433147096226],[1613516400000,-0.8357362895423104],[1613602800000,-0.5901872577077749],[1613689200000,0.4652404389007492],[1613948400000,0.7387166627010888],[1614034800000,0.6296984147131646],[1614121200000,0.597220732990178],[1614207600000,-0.45944804378783566],[1614294000000,-1.952809940009137],[1614553200000,-1.430060618679485],[1614639600000,-1.3313860807479094],[1614726000000,-1.3636570533070103],[1614812400000,-1.622445786457749],[1614898800000,-1.5049462738540242],[1615158000000,-1.1762370313930126]],"name":"BENCHM REF -1.18%"},{"data":[[1609282800000,0],[1609714800000,-0.064122924411536],[1609801200000,0.06495973868181348],[1609887600000,0.17579510798417797],[1609974000000,0.18422144298478882],[1610060400000,0.1803166752492702],[1610319600000,0.12526933464198642],[1610406000000,0.09651431271797684],[1610492400000,0.04594357104077407],[1610578800000,0.17551540007126887],[1610665200000,-0.1508676689759847],[1610924400000,-0.11934675209547274],[1611010800000,0.013467722727722453],[1611097200000,-0.08633473190139407],[1611183600000,-0.09410145594771491],[1611270000000,-0.08434532394342442],[1611529200000,0.05138690576131921],[1611615600000,0.046183351839390596],[1611702000000,0.3243546063364078],[1611788400000,0.3822366971745428],[1611874800000,0.3492858352316386],[1612134000000,0.15633148446092537],[1612220400000,0.1731552972445316],[1612306800000,0.264909578685546],[1612393200000,0.4408845043148091],[1612479600000,0.3245197734658922],[1612738800000,0.38474203088263437],[1612825200000,0.3679343723818618],[1612911600000,0.33797746992966227],[1612998000000,0.34592334618360754],[1613084400000,0.36963025783086634],[1613343600000,0.33360512748662474],[1613430000000,0.3360579818738163],[1613516400000,0.4704282905331536],[1613602800000,0.5295337405414324],[1613689200000,0.40449364871673055],[1613948400000,0.4893786599862837],[1614034800000,0.4562410617242163],[1614121200000,0.6091159963450998],[1614207600000,0.5671821859095649],[1614294000000,0.43209084945851073],[1614553200000,0.4483607872120876],[1614639600000,0.4070029517151075],[1614726000000,0.4920666136708385],[1614812400000,1.1943712443833632]],"color":"#ff0000","name":"Relative Performance +0.75%","yAxis":1,"compare":"amount","dashStyle":"ShortDash"}]}
This is the code I use to produce the .svg file
/opt/mx/reports/node_modules/highcharts-export-server/bin/cli.js -infile /opt/mx/reports/js/_testcases/stock.json -outfile /tmp/_teststockchart.svg -type svg -constr StockChart --logLevel 4
This is the .svg being produced:

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