# Null Pointer exception when saving the program

**URL:** <https://forum.universal-robots.com/t/null-pointer-exception-when-saving-the-program/34173>\
**Category:** Report a Bug\
**Created:** [May 13, 2024, 9:55am UTC](https://forum.universal-robots.com/t/null-pointer-exception-when-saving-the-program/34173 "2024-05-13T09:55:22Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![eric.feldmann](https://avatars.discourse-cdn.com/v4/letter/e/94ad74/32.png) [@eric.feldmann](https://forum.universal-robots.com/u/eric.feldmann)\
**Post date:** [May 13, 2024, 4:37pm UTC](https://forum.universal-robots.com/t/null-pointer-exception-when-saving-the-program/34173/4 "2024-05-13T16:37:04Z")

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Are you using subprograms in there? If so I’ll add your post to my list of others with the same problem.

> [@Palletizing in subprograms causes null pointers](https://forum.universal-robots.com/t/palletizing-in-subprograms-causes-null-pointers/30553):
>
> Steps to reproduce: Create a program with a Palletizing node. Put it in a subprogram. Reload the program. Get Nullpointers. Expected Behavior: Normal operation Actual Behavior: Palletizing node throws null pointers Workaround Suggestion: Can’t use Palletizing in subprograms Robot Serial Number: Various Affected Version(s): Unclear I’ve not personally had this problem, I’ve just seen it reported numerous times here on the forum with no response from UR. Please investigate this. @jbm …

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