diff --git a/modules/fbs-core/api/src/main/scala/de/thm/ii/fbs/controller/exception/MembershipExceededException.scala b/modules/fbs-core/api/src/main/scala/de/thm/ii/fbs/controller/exception/MembershipExceededException.scala
new file mode 100644
index 000000000..1971f61df
--- /dev/null
+++ b/modules/fbs-core/api/src/main/scala/de/thm/ii/fbs/controller/exception/MembershipExceededException.scala
@@ -0,0 +1,11 @@
+package de.thm.ii.fbs.controller.exception
+
+import org.springframework.http.HttpStatus
+import org.springframework.web.bind.annotation.ResponseStatus
+
+/**
+  * ConflictException 400
+  * @param message A human readable String
+  */
+@ResponseStatus(value = HttpStatus.CONFLICT)
+class MembershipExceededException(message: String = "Die Gruppe ist voll.") extends RuntimeException(message)
\ No newline at end of file