diff --git a/bar.go b/bar.go
index 6c30292..88f80b3 100644
--- a/bar.go
+++ b/bar.go
@@ -132,8 +132,11 @@
 // Given default bar style is "[=>-]<+", refill rune is '+'.
 // To set bar style use mpb.BarStyle(string) BarOption.
 func (b *Bar) SetRefill(amount int64) {
-	b.operateState <- func(s *bState) {
+	select {
+	case b.operateState <- func(s *bState) {
 		s.refill = amount
+	}:
+	case <-b.done:
 	}
 }