diff --git a/semantik-adapter/src/main/java/de/ozgcloud/eingang/semantik/formbased/MantelantragFormBasedMapper.java b/semantik-adapter/src/main/java/de/ozgcloud/eingang/semantik/formbased/MantelantragFormBasedMapper.java
index e0b943c707fe2346ccc383406a2ac8db6425be13..d6e7196a5e2e471cebf54f5891fd5de2f91405ae 100644
--- a/semantik-adapter/src/main/java/de/ozgcloud/eingang/semantik/formbased/MantelantragFormBasedMapper.java
+++ b/semantik-adapter/src/main/java/de/ozgcloud/eingang/semantik/formbased/MantelantragFormBasedMapper.java
@@ -13,9 +13,11 @@ import de.ozgcloud.eingang.common.errorhandling.TechnicalException;
 import de.ozgcloud.eingang.common.formdata.FormData;
 import de.ozgcloud.eingang.common.formdata.ZustaendigeStelle;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.log4j.Log4j2;
 
 @Component
 @RequiredArgsConstructor
+@Log4j2
 public class MantelantragFormBasedMapper implements FormBasedMapper {
 
 	private final Environment environment;
@@ -42,6 +44,15 @@ public class MantelantragFormBasedMapper implements FormBasedMapper {
 
 	@Override
 	public FormData adaptFormData(FormData formData) {
+		try {
+			return adaptFormDataWithPossibleException(formData);
+		} catch (TechnicalException exception) {
+			LOG.warn("Mantelantrag is invalid: %s".formatted(exception.getMessage()));
+			return formData;
+		}
+	}
+
+	FormData adaptFormDataWithPossibleException(FormData formData) {
 		var fieldMap = formData.getFormData();
 		var slotIndex = findSlotIndex(fieldMap);
 		UnaryOperator<String> getValueOrEmpty = field -> getFieldByKeyOrEmpty(
@@ -51,7 +62,7 @@ public class MantelantragFormBasedMapper implements FormBasedMapper {
 		var organisationseinheitId = getValueOrEmpty.apply(ORGANISATIONSEINHEIT_ID_FIELD);
 
 		if (organisationseinheitId.isBlank()) {
-			throw new TechnicalException("OrganistaionseinheitId not found in Mantelantrag!");
+			throw new TechnicalException("OrganistaionseinheitId not found!");
 		}
 
 		return formData.toBuilder()
diff --git a/semantik-adapter/src/test/java/de/ozgcloud/eingang/semantik/formbased/MantelantragFormBasedMapperTest.java b/semantik-adapter/src/test/java/de/ozgcloud/eingang/semantik/formbased/MantelantragFormBasedMapperTest.java
index 744115a5843d2b8e2b4bcb3b66c959b5fad093be..bdc78480b4ac075457653b3acb0d7e9cd15d3ebe 100644
--- a/semantik-adapter/src/test/java/de/ozgcloud/eingang/semantik/formbased/MantelantragFormBasedMapperTest.java
+++ b/semantik-adapter/src/test/java/de/ozgcloud/eingang/semantik/formbased/MantelantragFormBasedMapperTest.java
@@ -76,6 +76,37 @@ class MantelantragFormBasedMapperTest {
 	@Nested
 	class TestAdaptFormData {
 
+		@Mock
+		private FormData formData;
+
+		@Mock
+		private FormData formData2;
+
+		@DisplayName("should return adapted value")
+		@Test
+		void shouldReturnAdaptedValue() {
+			doReturn(formData2).when(mapper).adaptFormDataWithPossibleException(formData);
+
+			var resultFormData = mapper.adaptFormData(formData);
+
+			assertThat(resultFormData).isEqualTo(formData2);
+		}
+
+		@DisplayName("should return original value with exception")
+		@Test
+		void shouldReturnOriginalValueWithException() {
+			doThrow(new TechnicalException("some error")).when(mapper).adaptFormDataWithPossibleException(formData);
+
+			var resultFormData = mapper.adaptFormData(formData);
+
+			assertThat(resultFormData).isEqualTo(formData);
+		}
+	}
+
+	@DisplayName("adapt form data with possible exception")
+	@Nested
+	class TestAdaptFormDataWithPossibleException {
+
 		private FormData formData;
 
 		private Map<String, Object> fieldMap;