error when going on the results tab of an existing content view

On test platform, if I click on the "Result" tab of a content view already defined I have an error (see screenshot in attachment and link in comment) :
ncaught exception: com.google.gwt.event.shared.UmbrellaException: One or more exceptions caught, see full set in UmbrellaException#getCauses
at Unknown.re(Unknown Source)
at Unknown.lj(Unknown Source)
at Unknown.rz(Unknown Source)
at Unknown.uz(Unknown Source)
at Unknown.Qy(Unknown Source)
at Unknown.Ktb(Unknown Source)
at Unknown.Ttb(Unknown Source)
Caused by: com.google.gwt.event.shared.UmbrellaException: One or more exceptions caught, see full set in UmbrellaException#getCauses
at Unknown.re(Unknown Source)
at Unknown.lj(Unknown Source)
at Unknown.rz(Unknown Source)
at Unknown.uz(Unknown Source)
at Unknown.Qy(Unknown Source)
at Unknown.Ktb(Unknown Source)
at Unknown.Ttb(Unknown Source)
Caused by: com.google.gwt.core.client.JavaScriptException: (TypeError): Cannot read property 'bb' of null
at Unknown.Tvb(Unknown Source)
at Unknown.$Tc(Unknown Source)
at Unknown.dUc(Unknown Source)
at Unknown.fUc(Unknown Source)
at Unknown.TIc(Unknown Source)
at Unknown.kJc(Unknown Source)
at Unknown.Vx(Unknown Source)
at Unknown.bz(Unknown Source)
at Unknown.Qy(Unknown Source)
at Unknown.Ktb(Unknown Source)