Fix Schematic Creation

Signed-off-by: Chaoscaot <chaoscaot444@gmail.com>

SpigotCore_Main/src/de/steamwar/sql/SchematicNode.java

@@ -77,7 +77,7 @@ public class SchematicNode {
     }
 
     public static SchematicNode createSchematicNode(int owner, String name, Integer parent, String type, String item) {
-        if (parent == 0)
+        if (parent != null && parent == 0)
             parent = null;
         createNode.update(name, owner, parent, type, item);
         return getSchematicNode(owner, name, parent);