bugfix

src/main/java/de/srsoftware/widerhall/data/Database.java

@@ -133,7 +133,7 @@ public class Database {
 
         @Override
         protected Request clone() {
-            Request clone = new Request(sql);
+            Request clone = new Request(new StringBuilder(sql));
             clone.where.putAll(where);
             clone.values.putAll(values);
             return clone;