fix(aggreator): ticker panic when step <= 0
fix(aggreator): ticker panic when step <= 0

jojohappy/falcon-plus,taomaree/falcon-plus,jojohappy/falcon-plus,taomaree/falcon-plus,open-falcon/falcon-plus,jojohappy/falcon-plus,taomaree/falcon-plus,open-falcon/falcon-plus,jojohappy/falcon-plus,open-falcon/falcon-plus,open-falcon/falcon-plus,open-falcon/falcon-plus,jojohappy/falcon-plus,taomaree/falcon-plus,taomaree/falcon-plus,jojohappy/falcon-plus,taomaree/falcon-plus