# Null Pointer Exception in Polyscope 5.20

**URL:** <https://forum.universal-robots.com/t/null-pointer-exception-in-polyscope-5-20/38273>\
**Category:** Report a Bug\
**Created:** [January 28, 2025, 7:36am UTC](https://forum.universal-robots.com/t/null-pointer-exception-in-polyscope-5-20/38273 "2025-01-28T07:36:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![moberhofer](https://avatars.discourse-cdn.com/v4/letter/m/c77e96/32.png) [@moberhofer](https://forum.universal-robots.com/u/moberhofer)\
**Post date:** [January 28, 2025, 7:36am UTC](https://forum.universal-robots.com/t/null-pointer-exception-in-polyscope-5-20/38273/1 "2025-01-28T07:36:50Z")

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I discovered a Null Pointer Exception in Polyscope 5.20. The error occurs after a safety stop of the robot, when attempting to save or start the program afterward. The only solution is to restart the robot. It is likely related to the palletizing function.

 ![20241219_112325](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/2X/f/f96dc75b28979dafc50375d30c8ff531f72b8044.jpeg)