Pie Chart - ERROR Error: Invalid column index null. Should be an integer in the range [0-1]

[Vishnuraj910]

Getting below error when clicking on pie chart

ERROR Error: Invalid column index null. Should be an integer in the range [0-1]. at gvjs_en (jsapi_compiled_default_module.js:75) at gvjs_P.gvjs_.getValue (jsapi_compiled_default_module.js:89) at angular2-google-chart.directive.ts:52 at gvjs_Zn.<anonymous> (jsapi_compiled_default_module.js:179) at gvjs__n (jsapi_compiled_default_module.js:129) at gvjs_Zn.gvjs_.dispatchEvent (jsapi_compiled_default_module.js:127) at gvjs_U (jsapi_compiled_default_module.js:178) at jsapi_compiled_default_module.js:252 at gvjs_Zn.<anonymous> (jsapi_compiled_default_module.js:179) at gvjs__n (jsapi_compiled_default_module.js:129)