FIX: Fixed a NullPointerException

src/main/java/org/caosdb/server/query/POV.java

@@ -278,7 +278,11 @@ public class POV implements EntityFilterInterface {
           callPOV.setInt(7, this.vInt);
           callPOV.setDouble(8, vDoubleSubst);
         } else {
-          callPOV.setInt(7, vIntSubst);
+          if (vIntSubst == null) {
+            callPOV.setNull(7, INTEGER);
+          } else {
+            callPOV.setInt(7, vIntSubst);
+          }
           callPOV.setDouble(8, this.vDouble);
         }
       } else {