diff --git a/src/cpl_core/cpl-core.json b/src/cpl_core/cpl-core.json
index 1af2960f..2072dda3 100644
--- a/src/cpl_core/cpl-core.json
+++ b/src/cpl_core/cpl-core.json
@@ -4,7 +4,7 @@
     "Version": {
       "Major": "2022",
       "Minor": "12",
-      "Micro": "1"
+      "Micro": "1.post1"
     },
     "Author": "Sven Heidemann",
     "AuthorEmail": "sven.heidemann@sh-edraft.de",
diff --git a/src/cpl_core/dependency_injection/service_provider_abc.py b/src/cpl_core/dependency_injection/service_provider_abc.py
index a3f7158c..f2890d3c 100644
--- a/src/cpl_core/dependency_injection/service_provider_abc.py
+++ b/src/cpl_core/dependency_injection/service_provider_abc.py
@@ -13,14 +13,16 @@ class ServiceProviderABC(ABC):
     _provider: Optional['ServiceProviderABC'] = None
 
     @abstractmethod
-    def __init__(self): pass
+    def __init__(self):
+        pass
 
     @classmethod
     def set_global_provider(cls, provider: 'ServiceProviderABC'):
         cls._provider = provider
 
     @abstractmethod
-    def build_by_signature(self, sig: Signature) -> list[T]: pass
+    def build_by_signature(self, sig: Signature) -> list[T]:
+        pass
 
     @abstractmethod
     def build_service(self, service_type: type) -> object:
@@ -108,7 +110,7 @@ class ServiceProviderABC(ABC):
             if cls._provider is None:
                 raise Exception(f'{cls.__name__} not build!')
 
-            injection = cls._provider.build_by_signature(signature(f))
+            injection = [x for x in cls._provider.build_by_signature(signature(f)) if x is not None]
             return f(*injection, *args, **kwargs)
 
         return inner