grunt concat trying to read the inlined source map as a file name

I use browserify to bundle some files and when the 'debug' option is true it also adds a source map at the end of the file//# sourceMappingURL=data:application/json;charset:utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2Vz...The problem is when I concatenate this file with another one through grunt-contrib-concat, it tries to read the sourceMappingURL as a file name. So I get this error Warning: Unable to read "E:\xampp\htdocs\frontend\app\newportal\portal\data:application\json;charset:utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3Vy...I tried everything I could ...Read more