diff --git a/executor.go b/executor.go
index 0e70de6f0..3751a018c 100644
--- a/executor.go
+++ b/executor.go
@@ -1015,6 +1015,8 @@ func (e *executor) executeGenericFieldShard(ctx context.Context, index string, c
 		filter = row
 		if filter != nil && len(filter.segments) > 0 {
 			filterBitmap = filter.segments[0].data
+		} else {
+			filterBitmap = roaring.NewFileBitmap()
 		}
 	}