TypeError: this.addModel is not a function

[darkpixel]

Trying to add an uploaded model into a project hangs on the "importing model" screen.
This is thrown in the javascript console:

chunk-vendors~1c3a2c3f.caa047f0.js:1 TypeError: this.addModel is not a function
    at addModelToApp (app~06837ae4.bundle.js:1)
    at click (app~06837ae4.bundle.js:1)
    at ne (chunk-vendors~1c3a2c3f.caa047f0.js:7)
    at a.n (chunk-vendors~1c3a2c3f.caa047f0.js:7)
    at ne (chunk-vendors~1c3a2c3f.caa047f0.js:7)
    at a.Sn.t.$emit (chunk-vendors~1c3a2c3f.caa047f0.js:7)
    at a.click (chunk-vendors~86b7d105.7b69cf97.js:1)
    at ne (chunk-vendors~1c3a2c3f.caa047f0.js:7)
    at HTMLDivElement.n (chunk-vendors~1c3a2c3f.caa047f0.js:7)
    at HTMLDivElement.Zo.i._wrapper (chunk-vendors~1c3a2c3f.caa047f0.js:7)