diff --git a/src/cpl/application/application_abc.py b/src/cpl/application/application_abc.py
index b6ecb2a3..d680c542 100644
--- a/src/cpl/application/application_abc.py
+++ b/src/cpl/application/application_abc.py
@@ -4,6 +4,7 @@ from typing import Type, Optional
 from cpl.application.application_host_abc import ApplicationHostABC
 from cpl.application.startup_abc import StartupABC
 from cpl.configuration.configuration_abc import ConfigurationABC
+from cpl.console.console import Console
 from cpl.dependency_injection.service_provider_base import ServiceProviderABC
 
 
@@ -26,6 +27,18 @@ class ApplicationABC(ABC):
             self._services = self._startup.create_services()
 
     def run(self):
+        if self._app_host is None:
+            Console.error('Application host is empty')
+            exit()
+
+        if self._configuration is None:
+            Console.error('Configuration is empty')
+            exit()
+
+        if self._services is None:
+            Console.error('Service provider is empty')
+            exit()
+
         self.configure()
         self.main()
 
diff --git a/src/tests/Application.py b/src/tests/application.py
similarity index 100%
rename from src/tests/Application.py
rename to src/tests/application.py
diff --git a/src/tests/main.py b/src/tests/main.py
index 2899c38f..df3781fe 100644
--- a/src/tests/main.py
+++ b/src/tests/main.py
@@ -1,4 +1,4 @@
-from tests.Application import Application
+from tests.application import Application
 from tests.startup import Startup
 
 if __name__ == '__main__':