diff --git a/kubernetes-kit-starter/src/main/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/SpringTransientHandler.java b/kubernetes-kit-starter/src/main/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/SpringTransientHandler.java
index b4174e3..ad34782 100644
--- a/kubernetes-kit-starter/src/main/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/SpringTransientHandler.java
+++ b/kubernetes-kit-starter/src/main/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/SpringTransientHandler.java
@@ -104,7 +104,8 @@ private TransientDescriptor detectBean(Object target, Field field) {
 
     private boolean matchesPrototype(String beanName, Object beanDefinition,
             Class<?> fieldValueType) {
-        return appCtx.isPrototype(beanName)
+        return appCtx.containsBeanDefinition(beanName)
+                && appCtx.isPrototype(beanName)
                 && beanDefinition.getClass() == fieldValueType;
     }
 
diff --git a/kubernetes-kit-starter/src/test/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/SerializationDeserializationTest.java b/kubernetes-kit-starter/src/test/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/SerializationDeserializationTest.java
index 084c6ac..21477b5 100644
--- a/kubernetes-kit-starter/src/test/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/SerializationDeserializationTest.java
+++ b/kubernetes-kit-starter/src/test/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/SerializationDeserializationTest.java
@@ -45,7 +45,6 @@ void processConstructorInjectedComponent(
                         .readWithTransients();
         Assertions.assertThat(result).isNotSameAs(target)
                 .isExactlyInstanceOf(TestConfig.CtorInjectionTarget.class)
-                .hasNoNullFieldsOrProperties()
                 .asInstanceOf(InstanceOfAssertFactories
                         .type(TestConfig.CtorInjectionTarget.class))
                 .extracting(obj -> obj.defaultImpl, obj -> obj.alternative)
diff --git a/kubernetes-kit-starter/src/test/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/TestConfig.java b/kubernetes-kit-starter/src/test/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/TestConfig.java
index fa5416a..fbcdd90 100644
--- a/kubernetes-kit-starter/src/test/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/TestConfig.java
+++ b/kubernetes-kit-starter/src/test/java/com/vaadin/kubernetes/starter/sessiontracker/serialization/TestConfig.java
@@ -61,6 +61,7 @@ public void execute() {
     static class CtorInjectionTarget implements Serializable {
         transient TestService defaultImpl;
         transient TestService alternative;
+        transient Object nonBeanTransient = new Object();
 
         public CtorInjectionTarget(TestService defaultImpl,
                 @Qualifier("ALTERNATIVE") TestService alternative) {
@@ -91,6 +92,7 @@ static class PrototypeTarget implements Serializable {
         @Autowired
         @Qualifier("EXTENSION")
         transient PrototypeComponent extPrototypeScoped;
+        transient Object nonBeanTransient = new Object();
     }
 
     interface PrototypeService {
@@ -119,6 +121,7 @@ static class PrototypeServiceTarget implements Serializable {
         @Autowired
         @Qualifier("B")
         transient PrototypeService prototypeServiceB;
+        transient Object nonBeanTransient = new Object();
     }
 
     @Component