diff --git a/src/main/java/ru/touchin/roboswag/core/observables/storable/Storable.java b/src/main/java/ru/touchin/roboswag/core/observables/storable/Storable.java
index 5fb4dd2..acc748a 100644
--- a/src/main/java/ru/touchin/roboswag/core/observables/storable/Storable.java
+++ b/src/main/java/ru/touchin/roboswag/core/observables/storable/Storable.java
@@ -295,7 +295,7 @@ public class Storable<TKey, TObject, TStoreObject> {
         return internalSet(newValue, true).toObservable();
     }
 
-    public void setCalm(final TObject value) {
+    public void setCalm(@Nullable final TObject value) {
         set(value).subscribe(Actions.empty(), Lc::assertion);
     }
 
diff --git a/src/main/java/ru/touchin/roboswag/core/observables/storable/concrete/NonNullStorable.java b/src/main/java/ru/touchin/roboswag/core/observables/storable/concrete/NonNullStorable.java
index ef8610f..16840a9 100644
--- a/src/main/java/ru/touchin/roboswag/core/observables/storable/concrete/NonNullStorable.java
+++ b/src/main/java/ru/touchin/roboswag/core/observables/storable/concrete/NonNullStorable.java
@@ -36,8 +36,6 @@ import ru.touchin.roboswag.core.utils.ShouldNotHappenException;
  */
 public class NonNullStorable<TKey, TObject, TStoreObject> extends Storable<TKey, TObject, TStoreObject> {
 
-    private boolean calm;
-
     public NonNullStorable(@NonNull final NonNullStorableBuilder<TKey, TObject, TStoreObject> builderCore) {
         super(builderCore);
     }