diff --git a/src/main/java/de/ids_mannheim/korap/KrillCollection.java b/src/main/java/de/ids_mannheim/korap/KrillCollection.java
index 58761d7..82b0908 100644
--- a/src/main/java/de/ids_mannheim/korap/KrillCollection.java
+++ b/src/main/java/de/ids_mannheim/korap/KrillCollection.java
@@ -86,7 +86,7 @@
         try {
             JsonNode json = mapper.readTree(jsonString);
  
-            if (json.has("errors") & json.get("errors").size()>0){
+            if (json.has("errors") && json.get("errors").size()>0){
                 this.addError(StatusCode.INVALID_QUERY,"Json has errors.");
             }
             else if (json.has("collection")){
diff --git a/src/main/java/de/ids_mannheim/korap/response/Notifications.java b/src/main/java/de/ids_mannheim/korap/response/Notifications.java
index 274ca09..0d788b3 100644
--- a/src/main/java/de/ids_mannheim/korap/response/Notifications.java
+++ b/src/main/java/de/ids_mannheim/korap/response/Notifications.java
@@ -239,6 +239,13 @@
         return this;
     };
     
+    public Notifications addError (int code, String[] terms) {
+        if (this.errors == null)
+            this.errors = new Messages();
+        this.errors.add(code, terms[0], Arrays.copyOfRange(terms, 1, terms.length));
+        return this;
+    }
+    
     public Notifications addError (StatusCode status, String msg, String ... terms) {
         if (this.errors == null)
             this.errors = new Messages();
diff --git a/src/main/java/de/ids_mannheim/korap/util/StatusCode.java b/src/main/java/de/ids_mannheim/korap/util/StatusCodes.java
similarity index 100%
rename from src/main/java/de/ids_mannheim/korap/util/StatusCode.java
rename to src/main/java/de/ids_mannheim/korap/util/StatusCodes.java