Fix valgrind 'invalid read of size 1' bug.
Fix valgrind 'invalid read of size 1' bug.

prashasthip/peloton,yingjunwu/peloton,haojin2/peloton,malin1993ml/peloton,PauloAmora/peloton,AngLi-Leon/peloton,seojungmin/peloton,cmu-db/peloton,cmu-db/peloton,AngLi-Leon/peloton,seojungmin/peloton,AllisonWang/peloton,PauloAmora/peloton,seojungmin/peloton,apavlo/peloton,haojin2/peloton,AllisonWang/peloton,malin1993ml/peloton,haojin2/peloton,PauloAmora/peloton,prashasthip/peloton,cmu-db/peloton,AllisonWang/peloton,apavlo/peloton,AngLi-Leon/peloton,malin1993ml/peloton,vittvolt/peloton,vittvolt/peloton,malin1993ml/peloton,vittvolt/peloton,prashasthip/peloton,haojin2/peloton,yingjunwu/peloton,PauloAmora/peloton,PauloAmora/peloton,prashasthip/peloton,apavlo/peloton,seojungmin/peloton,apavlo/peloton,yingjunwu/peloton,PauloAmora/peloton,vittvolt/peloton,AllisonWang/peloton,cmu-db/peloton,apavlo/peloton,vittvolt/peloton,AllisonWang/peloton,prashasthip/peloton,vittvolt/peloton,seojungmin/peloton,apavlo/peloton,yingjunwu/peloton,AngLi-Leon/peloton,yingjunwu/peloton,prashasthip/peloton,AngLi-Leon/peloton,cmu-db/peloton,yingjunwu/peloton,malin1993ml/peloton,haojin2/peloton,AllisonWang/peloton,cmu-db/peloton,seojungmin/peloton,haojin2/peloton,malin1993ml/peloton,AngLi-Leon/peloton