fix failed assertion caught by #1157 fix
fix failed assertion caught by #1157 fix

coupa/resque,Shopify/resque,stvp/resque,xiangzhuyuan/resque,CloudVLab/resque,resque/resque,ejlangev/resque,ejlangev/resque,resque/resque,stvp/resque,Shopify/resque,xiangzhuyuan/resque,coupa/resque,stvp/resque,xiangzhuyuan/resque,Shopify/resque,CloudVLab/resque,coupa/resque,resque/resque,CloudVLab/resque