fix segfault

1 files changed, 2 insertions, 0 deletions

diff --git a/ydb/core/viewer/json_nodes.h b/ydb/core/viewer/json_nodes.h
index 5b2b983aa2f..765bfb50819 100644
--- a/ydb/core/viewer/json_nodes.h
+++ b/ydb/core/viewer/json_nodes.h
@@ -415,6 +415,8 @@ public:
         auto itPDiskInfo = PDiskInfo.find(pDiskId.first);
         if (itPDiskInfo == PDiskInfo.end()) {
             itPDiskInfo = PDiskInfo.insert({pDiskId.first, MakeHolder<TEvWhiteboard::TEvPDiskStateResponse>()}).first;
+        } else if (itPDiskInfo->second == nullptr) {
+            itPDiskInfo->second = MakeHolder<TEvWhiteboard::TEvPDiskStateResponse>();
         }
 
         for (auto& pDiskInfo : *itPDiskInfo->second->Record.mutable_pdiskstateinfo()) {