diff --git a/scm-webapp/src/main/java/sonia/scm/api/InvalidFormatExceptionMapper.java b/scm-webapp/src/main/java/sonia/scm/api/InvalidFormatExceptionMapper.java
new file mode 100644
index 0000000000..97dd96a23a
--- /dev/null
+++ b/scm-webapp/src/main/java/sonia/scm/api/InvalidFormatExceptionMapper.java
@@ -0,0 +1,59 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.api;
+
+import com.fasterxml.jackson.databind.exc.InvalidFormatException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.slf4j.MDC;
+import sonia.scm.api.v2.resources.ErrorDto;
+import sonia.scm.web.VndMediaType;
+
+import javax.ws.rs.core.Response;
+import javax.ws.rs.ext.ExceptionMapper;
+import javax.ws.rs.ext.Provider;
+import java.util.Collections;
+
+@Provider
+public class InvalidFormatExceptionMapper implements ExceptionMapper<InvalidFormatException> {
+
+  private static final Logger LOG = LoggerFactory.getLogger(InvalidFormatExceptionMapper.class);
+
+  private static final String ERROR_CODE = "2qRyyaVcJ1";
+
+  @Override
+  public Response toResponse(InvalidFormatException exception) {
+    LOG.trace("got invalid format in json: {}", exception.getMessage());
+    ErrorDto errorDto = new ErrorDto();
+    errorDto.setMessage("invalid format in json content: " + exception.getMessage());
+    errorDto.setContext(Collections.emptyList());
+    errorDto.setErrorCode(ERROR_CODE);
+    errorDto.setTransactionId(MDC.get("transaction_id"));
+    return Response.status(Response.Status.BAD_REQUEST)
+      .entity(errorDto)
+      .type(VndMediaType.ERROR_TYPE)
+      .build();
+  }
+}
diff --git a/scm-webapp/src/main/resources/locales/de/plugins.json b/scm-webapp/src/main/resources/locales/de/plugins.json
index 8c5c88e0f8..314dac3de4 100644
--- a/scm-webapp/src/main/resources/locales/de/plugins.json
+++ b/scm-webapp/src/main/resources/locales/de/plugins.json
@@ -215,6 +215,10 @@
     "8nRuFzjss1": {
       "displayName": "Fehler beim Löschen falscher Downloads",
       "description": "Ein fehlerhaft heruntergeladenes Plugin konnte nicht gelöscht werden. Bitte prüfen Sie die Server Logs und löschen die Datei manuell."
+    },
+    "2qRyyaVcJ1": {
+      "displayName": "Ungültig formatiertes Element",
+      "description": "Die Eingabe beinhaltete unfültige Formate. Bitte prüfen Sie die Server Logs für genauere Informationen."
     }
   },
   "namespaceStrategies": {
diff --git a/scm-webapp/src/main/resources/locales/en/plugins.json b/scm-webapp/src/main/resources/locales/en/plugins.json
index 998e796bac..fba82da650 100644
--- a/scm-webapp/src/main/resources/locales/en/plugins.json
+++ b/scm-webapp/src/main/resources/locales/en/plugins.json
@@ -215,6 +215,10 @@
     "8nRuFzjss1": {
       "displayName": "Error while cleaning up failed plugin",
       "description": "A failed plugin download could not be removed correctly. Please check the server log and remove the plugin manually."
+    },
+    "2qRyyaVcJ1": {
+      "displayName": "Invalid format in element",
+      "description": "The input had some invalid formats. Please check the server log for further information."
     }
   },
   "namespaceStrategies": {
diff --git a/scm-webapp/src/test/java/sonia/scm/api/InvalidFormatExceptionMapperTest.java b/scm-webapp/src/test/java/sonia/scm/api/InvalidFormatExceptionMapperTest.java
new file mode 100644
index 0000000000..c06da77c92
--- /dev/null
+++ b/scm-webapp/src/test/java/sonia/scm/api/InvalidFormatExceptionMapperTest.java
@@ -0,0 +1,74 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.api;
+
+import org.jboss.resteasy.mock.MockDispatcherFactory;
+import org.jboss.resteasy.mock.MockHttpRequest;
+import org.jboss.resteasy.mock.MockHttpResponse;
+import org.jboss.resteasy.spi.Dispatcher;
+import org.junit.jupiter.api.Test;
+
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import java.io.UnsupportedEncodingException;
+import java.net.URISyntaxException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class InvalidFormatExceptionMapperTest {
+
+  @Test
+  void shouldMapInvalidFormatExceptionDueToInvalidEnum() throws URISyntaxException, UnsupportedEncodingException {
+    Dispatcher dispatcher = MockDispatcherFactory.createDispatcher();
+    dispatcher.getRegistry().addSingletonResource(new SimpleResource());
+    dispatcher.getProviderFactory().registerProvider(InvalidFormatExceptionMapper.class);
+
+    MockHttpRequest request = MockHttpRequest
+      .post("/")
+      .contentType("application/json")
+      .content("{\"e\": \"NONE\"}".getBytes());
+    MockHttpResponse response = new MockHttpResponse();
+
+    dispatcher.invoke(request, response);
+
+    assertThat(response.getStatus()).isEqualTo(400);
+    assertThat(response.getContentAsString()).contains("2qRyyaVcJ1");
+  }
+
+  @Path("/")
+  static class SimpleResource {
+    @POST
+    public void post(ObjectWithEnum o) {
+    }
+  }
+
+  static class ObjectWithEnum {
+    public Enum e;
+  }
+
+  enum Enum {
+    ONE, TWO
+  }
+}