diff --git a/bar.go b/bar.go
index a7acbe6..d799d1d 100644
--- a/bar.go
+++ b/bar.go
@@ -210,6 +210,9 @@
 	for {
 		select {
 		case i := <-b.incrCh:
+			if i <= 0 {
+				break
+			}
 			n := state.current + i
 			if n > total {
 				state.current = total