# Serial number is null

**URL:** <https://forum.makecode.com/t/serial-number-is-null/30372>\
**Category:** Help\
**Tags:** extension\
**Created:** [August 30, 2024, 2:55pm UTC](https://forum.makecode.com/t/serial-number-is-null/30372 "2024-08-30T14:55:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![technonux](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/technonux/32/7924_2.png) [@technonux](https://forum.makecode.com/u/technonux)\
**Post date:** [August 30, 2024, 2:55pm UTC](https://forum.makecode.com/t/serial-number-is-null/30372/1 "2024-08-30T14:55:03Z")

</div>

im running it in [https://arcade.makecode.com/stable---multi#](https://arcade.makecode.com/stable---multi#)  
when radio sends a broadcast it will not show the serial number  
but control.serialnumber() works  
[https://arcade.makecode.com/S69220-54453-48041-57103](https://arcade.makecode.com/S69220-54453-48041-57103)  
[https://arcade.makecode.com/S20053-13889-46821-06199](https://arcade.makecode.com/S20053-13889-46821-06199)