r[i] is not a function TypeError: r[i] is not a function (when PUT fails)

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I have a microflow that does a PUT, if it fails, for some reason it crashes mendix. refreshing the browser solves it.   The easy solution of course, is to not have the PUT come back with an error. but I'm curious what is going on here, and how to fix it, for if it is unrelated, and there is something going on in the background with a NPE or NF.   r[i] is not a function TypeError: r[i] is not a function    at j.<computed>.E.<anonymous> (http://localhost:8080/mxclientsystem/mxui/mxui.js?638569170750724607:10:34060)    at j.<computed>.E.o [as destroy] (http://localhost:8080/mxclientsystem/mxui/mxui.js?638569170750724607:5:55310)    at u.Animation.onEnd (http://localhost:8080/mxclientsystem/mxui/mxui.js?638569170750724607:5:228717)    at u.Animation._fire (http://localhost:8080/mxclientsystem/mxui/mxui.js?638569170750724607:5:120423)    at u.Animation._cycle (http://localhost:8080/mxclientsystem/mxui/mxui.js?638569170750724607:5:122138)    at Object.<anonymous> (http://localhost:8080/mxclientsystem/mxui/mxui.js?638569170750724607:5:27323)    at Object.o [as run] (http://localhost:8080/mxclientsystem/mxui/mxui.js?638569170750724607:5:55459)    at http://localhost:8080/mxclientsystem/mxui/mxui.js?638569170750724607:5:27323 exception in animation handler for: onEnd  
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