TypeError: Object -57 has no method 'indexOf'

indexOf works. It has worked before. Now it says TypeError: Object -57 has no method 'indexOf' totals = _.reduce(findObjs({     pageid: page,     type: 'graphic',     isdrawing: false,     layer: 'objects' }),function(m,o){     log(o.get('_id'));     if(o.get('name').indexOf( 'Treasury' ) > -1) {          m.treasury+=parseFloat(o.get('bar3_value')) || 0;      } return m; },{ bar1: 0, bar2: 0, cityIncome: 0, numberOfcities: 0, treasury: 0, resourceIncome: 0}); // this is where you initialize fields but checking the _id of the object turns out: "-K08foEXiyy8ZuuVyORh" "-K08h-y2pZjxrTKeHGIW" "-K08i9nf6wr_lBhWNDDe" How do I find which one is object -57, to help with debugging?

If I had to guess, I'd say some script has set the name of the token to the integer value -57, rather than a string '-57'.  The easiest way to guard against that is with implicit conversion to a string: totals = _.reduce(findObjs({     pageid: page,     type: 'graphic',     isdrawing: false,     layer: 'objects' }), function(m,o){     log(o.get('_id'));     if( (''+o.get('name')) .indexOf( 'Treasury' ) > -1) {          m.treasury+=parseFloat(o.get('bar3_value')) || 0;      } return m; }, { bar1: 0, bar2: 0, cityIncome: 0, numberOfcities: 0, treasury: 0, resourceIncome: 0 } ); // this is where you initialize fields

Indeed, that is exactly what happened, and that protection works :) wizard..