javascript - ykeys null in morris line chart -

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i have 3 ykeys parameters , 1 or other ykey value null. eventhough have 1 null ykey, should line chart other ykeys. that's not happening. i'm getting blank chart , getting 'svg' error.

kindly on this, here tried far:

new morris.line({ element: 'divname',                   data: [ { year: '2008', a: '',b:'10',c:'20'},                           { year: '2009', a: '',b:'15',c:'25'},                           { year: '2010', a:'',b: '5' ,c:'10'} ],                   xkey: 'year',                   ykeys: ['a','b','c'],                   labels: ['a','b','c'] });

-- in case need line chart b , c values. i'm getting svg error empty chart


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