diff --git a/formcycle-adapter/formcycle-adapter-impl/src/main/java/de/ozgcloud/eingang/formcycle/FormDataController.java b/formcycle-adapter/formcycle-adapter-impl/src/main/java/de/ozgcloud/eingang/formcycle/FormDataController.java
index 4e6fbc510208c4bc5154d7b6e98327c938cc2af4..0410813ad315d187602dfda312278af02a99f9b0 100644
--- a/formcycle-adapter/formcycle-adapter-impl/src/main/java/de/ozgcloud/eingang/formcycle/FormDataController.java
+++ b/formcycle-adapter/formcycle-adapter-impl/src/main/java/de/ozgcloud/eingang/formcycle/FormDataController.java
@@ -32,6 +32,7 @@ import java.util.Objects;
 import java.util.Optional;
 import java.util.UUID;
 
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -166,7 +167,7 @@ class FormDataController {
 		return ServiceKonto.builder()
 				.type(formCycleServiceKonto.getType())
 				.postfachAddress(buildPostfachAddress(formCycleServiceKonto))
-				.trustLevel(formCycleServiceKonto.getTrustLevel())
+				.trustLevel(StringUtils.trimToNull(formCycleServiceKonto.getTrustLevel()))
 				.build();
 	}
 
diff --git a/formcycle-adapter/formcycle-adapter-impl/src/test/java/de/ozgcloud/eingang/formcycle/FormDataControllerTest.java b/formcycle-adapter/formcycle-adapter-impl/src/test/java/de/ozgcloud/eingang/formcycle/FormDataControllerTest.java
index 06704947aea190ae8c3ee084a492c3b6d808e479..2a6a232a9b985f979d3f5e7413d0ebf770eff182 100644
--- a/formcycle-adapter/formcycle-adapter-impl/src/test/java/de/ozgcloud/eingang/formcycle/FormDataControllerTest.java
+++ b/formcycle-adapter/formcycle-adapter-impl/src/test/java/de/ozgcloud/eingang/formcycle/FormDataControllerTest.java
@@ -34,7 +34,9 @@ import java.io.ByteArrayOutputStream;
 import java.util.Collections;
 import java.util.Optional;
 
+import org.apache.commons.lang3.StringUtils;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.mockito.ArgumentCaptor;
@@ -56,8 +58,8 @@ import de.ozgcloud.eingang.common.formdata.IncomingFileGroupTestFactory;
 import de.ozgcloud.eingang.common.formdata.IncomingFileTestFactory;
 import de.ozgcloud.eingang.common.formdata.ServiceKonto.PostfachAddress;
 import de.ozgcloud.eingang.common.formdata.ServiceKontoTestFactory;
-import de.ozgcloud.eingang.common.vorgang.VorgangNummerSupplier;
 import de.ozgcloud.eingang.common.formdata.StringBasedIdentifier;
+import de.ozgcloud.eingang.common.vorgang.VorgangNummerSupplier;
 import de.ozgcloud.eingang.semantik.SemantikAdapter;
 import lombok.SneakyThrows;
 
@@ -298,6 +300,7 @@ class FormDataControllerTest {
 		}
 	}
 
+	@DisplayName("ServiceKonto mapping")
 	@Nested
 	class TestServiceKontoMapping {
 
@@ -315,14 +318,29 @@ class FormDataControllerTest {
 			verify(controller, never()).buildServiceKonto(any());
 		}
 
-		@Test
-		void shouldMapTrustLevel() {
-			var formData = controller.addServiceKonto(FormCycleFormDataTestFactory.create(), buildEmptyFormDataWithHeader());
+		@DisplayName("trustLevel")
+		@Nested
+		class TestTrustLevel {
+
+			@Test
+			void shouldMap() {
+				var formData = controller.addServiceKonto(FormCycleFormDataTestFactory.create(), buildEmptyFormDataWithHeader());
+
+				assertThat(formData.getHeader().getServiceKonto().getTrustLevel()).isEqualTo(ServiceKontoTestFactory.TRUST_LEVEL);
+			}
 
-			assertThat(formData.getHeader().getServiceKonto().getTrustLevel()).isEqualTo(ServiceKontoTestFactory.TRUST_LEVEL);
+			@Test
+			void shouldMapAsNullIfEmpty() {
+				var serviceKontoWithEmptyTrustLevel = FormCycleServiceKontoTestFactory.createBuilder().setTrustLevel(StringUtils.EMPTY).build();
+				var formCycleFormData = FormCycleFormDataTestFactory.createBuilder().setServiceKonto(serviceKontoWithEmptyTrustLevel).build();
+
+				var formData = controller.addServiceKonto(formCycleFormData, buildEmptyFormDataWithHeader());
+
+				assertThat(formData.getHeader().getServiceKonto().getTrustLevel()).isNull();
+			}
 		}
 
-		String getServiceKontoType(FormData formData) {
+		private String getServiceKontoType(FormData formData) {
 			return formData.getHeader().getServiceKonto().getType();
 		}