diff --git a/bar_option.go b/bar_option.go
index 660e7c4..4ba4905 100644
--- a/bar_option.go
+++ b/bar_option.go
@@ -89,7 +89,10 @@
 	return BarFillerMiddleware(func(base BarFiller) BarFiller {
 		return BarFillerFunc(func(w io.Writer, reqWidth int, st decor.Statistics) {
 			if st.Completed {
-				io.WriteString(w, message)
+				_, err := io.WriteString(w, message)
+				if err != nil {
+					panic(err)
+				}
 			} else {
 				base.Fill(w, reqWidth, st)
 			}
diff --git a/draw_test.go b/draw_test.go
index db112ba..b6fa7a6 100644
--- a/draw_test.go
+++ b/draw_test.go
@@ -774,7 +774,10 @@
 			s.trimSpace = tc.trim
 			s.refill = tc.refill
 			tmpBuf.Reset()
-			tmpBuf.ReadFrom(s.draw(newStatistics(tw, s)))
+			_, err := tmpBuf.ReadFrom(s.draw(newStatistics(tw, s)))
+			if err != nil {
+				t.FailNow()
+			}
 			by := tmpBuf.Bytes()
 
 			got := string(by[:len(by)-1])
@@ -1221,7 +1224,10 @@
 			s.trimSpace = tc.trim
 			s.refill = tc.refill
 			tmpBuf.Reset()
-			tmpBuf.ReadFrom(s.draw(newStatistics(tw, s)))
+			_, err := tmpBuf.ReadFrom(s.draw(newStatistics(tw, s)))
+			if err != nil {
+				t.FailNow()
+			}
 			by := tmpBuf.Bytes()
 
 			got := string(by[:len(by)-1])
@@ -1390,7 +1396,10 @@
 			s.trimSpace = tc.trim
 			s.refill = tc.refill
 			tmpBuf.Reset()
-			tmpBuf.ReadFrom(s.draw(newStatistics(tw, s)))
+			_, err := tmpBuf.ReadFrom(s.draw(newStatistics(tw, s)))
+			if err != nil {
+				t.FailNow()
+			}
 			by := tmpBuf.Bytes()
 
 			got := string(by[:len(by)-1])
diff --git a/progress.go b/progress.go
index a4a0d48..09b2887 100644
--- a/progress.go
+++ b/progress.go
@@ -320,7 +320,10 @@
 	for s.bHeap.Len() > 0 {
 		b := heap.Pop(&s.bHeap).(*Bar)
 		frame := <-b.frameCh
-		cw.ReadFrom(frame.reader)
+		_, err := cw.ReadFrom(frame.reader)
+		if err != nil {
+			return err
+		}
 		if b.toShutdown {
 			if b.recoveredPanic != nil {
 				s.barShutdownQueue = append(s.barShutdownQueue, b)