diff --git a/buzhash.go b/buzhash.go
index 4bbe009d8bab453919db93a5e59e9b9180727d84..40b2e9301d1c07af89808f9a6d8912c1d2a8bd6a 100644
--- a/buzhash.go
+++ b/buzhash.go
@@ -42,6 +42,7 @@ func (b *Buzhash) NextBytes() ([]byte, error) {
 		} else {
 			b.err = err
 			pool.Put(buf)
+			b.buf = nil
 			return nil, err
 		}
 	}