ESValueLabelDecorator>>chooseNonOverlappingValues has the line... 
    chosenValues add: (self values minValue: [:each | each value]).

but minValue: injects (Float infinity) so that if  'self values' is empty then (Float
infinity) is added to choseValues, which later are #rounded causing an error in the
Morph drawing and subsequent RSOD for the EyeSee morph.

I am not sure if I've done something wrong that causes 'self values' to be empty, but
in any case, this should not kill the Morph.

Just for further information, here is the triggering code...
    browser transmit from: #navigationtree; to: #attributes; andShow: 
    [   :a | 
                a eyesee 
            title: 'Optimize' ;
            diagram: 
            [   :renderer :input | 
                renderer scatterplot 
                    diagramTitle: '@', input absorbedLoad asString , 'kW' ;
                    x: #ratedOutput ;
                    y: [ :m | m powerLossForAbsorbedLoad: input absorbedLoad  ]  ; 
                    valueAxis ;
                    addXDecorator: ESValueLabelDecorator new ;
                    models: (LEKCatalogMotor catalog values sort: [ :m1 :m2 | m1 ratedOutput < m2
ratedOutput ]).
].

where if in a Workspace I do...
    models:= (LEKCatalogMotor catalog values sort: [ :m1 :m2 | m1 ratedOutput < m2
ratedOutput ])'.
    models collect: [ :m | m ratedOutput -> m powerLossForAbsorbedLoad: 24 ] explore

...then all the data looks okay.