diff --git a/.github/workflows/linux_llvm_cov.yml b/.github/workflows/linux_llvm_cov.yml
index 08cc89cc2..a1a7f1769 100644
--- a/.github/workflows/linux_llvm_cov.yml
+++ b/.github/workflows/linux_llvm_cov.yml
@@ -44,8 +44,11 @@ jobs:
           ./easylog_test 
           ./struct_pack_test 
           ./struct_pack_test_with_optimize
+          ./metric_test 
+          ./struct_pb_test 
+          ./reflection_test
           llvm-profdata merge -sparse test_ylt-*.profraw -o test_ylt.profdata
-          llvm-cov show coro_io_test -object coro_rpc_test -object easylog_test -object struct_pack_test -object struct_pack_test_with_optimize -instr-profile=test_ylt.profdata -format=html -output-dir=../../.coverage_llvm_cov -ignore-filename-regex="thirdparty|asio|src" -show-instantiations=false
+          llvm-cov show coro_io_test -object coro_rpc_test -object easylog_test -object struct_pack_test -object struct_pack_test_with_optimize ./metric_test ./struct_pb_test ./reflection_test -instr-profile=test_ylt.profdata -format=html -output-dir=../../.coverage_llvm_cov -ignore-filename-regex="thirdparty|asio|src" -show-instantiations=false
           echo "Done!"
 
       - name: Upload Coverage Results
diff --git a/include/ylt/metric/dynamic_metric.hpp b/include/ylt/metric/dynamic_metric.hpp
index 9753fb93c..6ddce3f51 100644
--- a/include/ylt/metric/dynamic_metric.hpp
+++ b/include/ylt/metric/dynamic_metric.hpp
@@ -97,8 +97,10 @@ class dynamic_metric_impl : public dynamic_metric {
     return map_.try_emplace_with_op(
         view,
         [](auto result) {
-          *const_cast<std::span<const std::string, N>*>(&result.first->first) =
-              result.first->second->label;
+          if (result.second) {
+            *const_cast<std::span<const std::string, N>*>(
+                &result.first->first) = result.first->second->label;
+          }
         },
         std::forward<Key>(key), std::forward<Args>(args)...);
   }