diff --git a/src/main/java/de/unistuttgart/memorybackend/service/ConfigService.java b/src/main/java/de/unistuttgart/memorybackend/service/ConfigService.java
index a9b2005..97f263d 100644
--- a/src/main/java/de/unistuttgart/memorybackend/service/ConfigService.java
+++ b/src/main/java/de/unistuttgart/memorybackend/service/ConfigService.java
@@ -88,7 +88,7 @@ public Configuration getAllConfigurations(final UUID id, final String accessToke
             try {
                 volumeLevel = Integer.parseInt(keyBindingVolumeLevel.getKey());
             } catch (NumberFormatException e) {
-                throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Invalid volume level format" + keyBindingVolumeLevel.getKey());
+                throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Invalid volume level format.");
             }
         }