diff --git a/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart b/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
index 923e556..f94382d 100644
--- a/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
+++ b/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
@@ -58,7 +58,7 @@
   final Compiler _compiler;
   final GlobalLocalsMap _globalLocalsMap;
   final InferredDataBuilder _inferredDataBuilder;
-  Metrics /*?*/ _metrics;
+  Metrics _metrics = Metrics.none();
 
   TypeGraphInferrer(this._compiler, this.closedWorld, this._globalLocalsMap,
       this._inferredDataBuilder);
diff --git a/pkg/compiler/lib/src/inferrer/types.dart b/pkg/compiler/lib/src/inferrer/types.dart
index 8705fb2..53f87234 100644
--- a/pkg/compiler/lib/src/inferrer/types.dart
+++ b/pkg/compiler/lib/src/inferrer/types.dart
@@ -169,7 +169,7 @@
 
   GlobalTypeInferenceResults resultsForTesting;
 
-  Metrics _metrics;
+  Metrics _metrics = Metrics.none();
 
   GlobalTypeInferenceTask(Compiler compiler)
       : compiler = compiler,
@@ -189,7 +189,6 @@
       if (compiler.disableTypeInference) {
         results =
             TrivialGlobalTypeInferenceResults(closedWorld, globalLocalsMap);
-        _metrics = Metrics.none();
       } else {
         typesInferrerInternal ??= compiler.backendStrategy.createTypesInferrer(
             closedWorld, globalLocalsMap, inferredDataBuilder);