New error opening treasure chest

[Santriani]

Yesterday and today got this error when I open a treasure chest:

1x ...lUI\Libs\LibArtifactData-1.0\LibArtifactData-1.0-6.lua:348: attempt to index local 'artifact' (a nil value)
...lUI\Libs\LibArtifactData-1.0\LibArtifactData-1.0-6.lua:348: in function '?'
...lUI\Libs\LibArtifactData-1.0\LibArtifactData-1.0-6.lua:67: in function <...lUI\Libs\LibArtifactData-1.0\LibArtifactData-1.0.lua:67>