diff --git a/crypto/block/mc-config.cpp b/crypto/block/mc-config.cpp
index 14881913..490ccade 100644
--- a/crypto/block/mc-config.cpp
+++ b/crypto/block/mc-config.cpp
@@ -2338,6 +2338,8 @@ td::Result<Ref<vm::Tuple>> ConfigInfo::get_prev_blocks_info() const {
       seqno -= 100;
     }
     tuple.push_back(td::make_cnt_ref<std::vector<vm::StackEntry>>(std::move(last_mc_blocks_100)));
+  } else if (get_global_version() == -1) {
+    return td::Status::Error("config version not set (needCapabilities)");
   }
 
   return td::make_cnt_ref<std::vector<vm::StackEntry>>(std::move(tuple));
diff --git a/validator/impl/liteserver.cpp b/validator/impl/liteserver.cpp
index 723dbfe9..50938cd5 100644
--- a/validator/impl/liteserver.cpp
+++ b/validator/impl/liteserver.cpp
@@ -1905,6 +1905,9 @@ void LiteQuery::continue_getConfigParams(int mode, std::vector<int> param_list)
     }
     cfg = res.move_as_ok();
   } else {
+    if (mode & block::ConfigInfo::needPrevBlocks) {
+      mode |= block::ConfigInfo::needCapabilities;
+    }
     auto res = block::ConfigInfo::extract_config(mpb.root(), mode);
     if (res.is_error()) {
       fatal_error(res.move_as_error());