usage graph display an undefined on the x - axis

[ermis]

Hello support,

Am not sure why the usage graph display an undefined on the x - axis

as shown here https://prnt.sc/hyCMXBIib895

also check here live https://ijessonline.com/index.php/ijess/article/view/2

Kind Request Simon

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Smartphone (please complete the following information):

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[asmecher]

@ermis, the best place to get support is the support forum: https://forum.pkp.sfu.ca
If it gets to be a confirmed bug, then we'll migrate it to Github issues.