fix.

1 files changed, 7 insertions, 1 deletions

diff --git a/ydb/library/yql/providers/s3/provider/yql_s3_io_discovery.cpp b/ydb/library/yql/providers/s3/provider/yql_s3_io_discovery.cpp
index ba69643da93..8f5f635a226 100644
--- a/ydb/library/yql/providers/s3/provider/yql_s3_io_discovery.cpp
+++ b/ydb/library/yql/providers/s3/provider/yql_s3_io_discovery.cpp
@@ -270,10 +270,16 @@ public:
                 continue;
             }
 
+            auto format = ExtractFormat(settings);
+            if (!format) {
+                ctx.AddError(TIssue(ctx.GetPosition(read.Ref().Child(4)->Pos()), "No read format specified."));
+                return TStatus::Error;
+            }
+
             TExprNode::TPtr s3Object;
             s3Object = Build<TS3Object>(ctx, object.Pos())
                     .Paths(ctx.NewList(object.Pos(), std::move(pathNodes)))
-                    .Format(ExtractFormat(settings))
+                    .Format(std::move(format))
                     .Settings(ctx.NewList(object.Pos(), std::move(settings)))
                 .Done().Ptr();