using a existing cancel button throws error after 7.18 upgrade

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i updated to 7.18 now on ever page where there is a system generated cancel button and  when i press it this button this is the error i get  Cannot read property 'isDeleted' of null TypeError: Cannot read property 'isDeleted' of null     at Object.callback (http://localhost:8080/mxclientsystem/mxui/mxui.js?636725460087591223:51:103025)     at Object.callback (http://localhost:8080/mxclientsystem/mxui/mxui.js?636725460087591223:74:153627)     at http://localhost:8080/mxclientsystem/mxui/mxui.js?636725460087591223:74:154999     at k (http://localhost:8080/widgets/PrintScreen/widget/lib/jspdf.js?636725460087591223:11913:2900)     at new j (http://localhost:8080/widgets/PrintScreen/widget/lib/jspdf.js?636725460087591223:11913:2828)     at http://localhost:8080/mxclientsystem/mxui/mxui.js?636725460087591223:74:154915     at Array.map (<anonymous>)     at u (http://localhost:8080/mxclientsystem/mxui/mxui.js?636725460087591223:74:154892)     at m.update2 (http://localhost:8080/mxclientsystem/mxui/mxui.js?636725460087591223:74:154697)     at http://localhost:8080/mxclientsystem/mxui/mxui.js?636725460087591223:74:160702
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1 answers
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According to support this is going to be fixed in version 7.19.

It's a shame that such known issues are never listed anywhere.

regards, Fabian

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