diff --git a/ioutils/bytespipe.go b/ioutils/bytespipe.go
index eca129b..72a04f3 100644
--- a/ioutils/bytespipe.go
+++ b/ioutils/bytespipe.go
@@ -133,8 +133,9 @@ func (bp *BytesPipe) Read(p []byte) (n int, err error) {
 		}
 		bp.wait.Wait()
 		if bp.bufLen == 0 && bp.closeErr != nil {
+			err := bp.closeErr
 			bp.mu.Unlock()
-			return 0, bp.closeErr
+			return 0, err
 		}
 	}