diff --git a/common/ipsetsink/sinkcluster/reader.go b/common/ipsetsink/sinkcluster/reader.go
index 3f7a08f..78d383b 100644
--- a/common/ipsetsink/sinkcluster/reader.go
+++ b/common/ipsetsink/sinkcluster/reader.go
@@ -55,6 +55,10 @@ func (c ClusterCounter) Count(reader io.Reader) (*ClusterCountResult, error) {
 			return nil, err
 		}
 	}
+	err = inputScanner.Err()
+	if err != nil {
+		return nil, err
+	}
 	result.Sum = counter.Count()
 	return &result, nil
 }