# Exception in flush\_handler **URL:** \ **Category:** General Discussion\ **Created:** [October 8, 2025, 2:36am UTC](https://klipper.discourse.group/t/exception-in-flush-handler/24976 "2025-10-08T02:36:34Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![JesNoFear](https://avatars.discourse-cdn.com/v4/letter/j/a87d85/32.png) [@JesNoFear](https://klipper.discourse.group/u/JesNoFear)\ **Post date:** [October 8, 2025, 2:36am UTC](https://klipper.discourse.group/t/exception-in-flush-handler/24976/1 "2025-10-08T02:36:34Z")
### Basic Information: Printer Model: Voron 2.4 R2 - Voron TAP - ERCF v2 12 channel - Custom Dryboxes MCU / Printerboard: - MCU: Octopus Pro v1.1 (STM32H723ZET6) - MMU: MMB CAN V2.0 (STM32G0B1RET6) - EBB36: EBB36 (STM32G0B1) - keb\_db\_right: SKRAT v1 (STM32G0B1) - keb\_db\_left: SKRAT v1 (STM32G0B1) Host / SBC: Super Micro X13SAV-LVDS klippy.log _Fill out above information and_ _ **in all cases attach your** _ **`klippy.log` _file_** (use zip to compress it, if too big). _Pasting your_ `printer.cfg` _is **not** needed_ _ **Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there** _ ### Describe your issue: Got “Exception in flush\_handler“ given you are currently focused on those modules. Figured this would be helpful. [klippy (23).zip](https://klipper.discourse.group/uploads/short-url/z4jlBOsXHHfUfEeAFznOCGRZ3UV.zip) (3.7 MB) ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [October 8, 2025, 8:06am UTC](https://klipper.discourse.group/t/exception-in-flush-handler/24976/2 "2025-10-08T08:06:44Z")
Can you determine the issue is not generated by one of these extras? ```auto Git version: 'v0.13.0-320-gc80324946-dirty' Untracked files: klippy/extras/led_effect.py, klippy/extras/mmu_encoder.py, klippy/extras/mmu_espooler.py, klippy/extras/mmu_led_effect.py, klippy/extras/mmu_leds.py, klippy/extras/mmu_machine.py, klippy/extras/mmu_sensors.py, klippy/extras/mmu_servo.py ``` In other words: Have you tried with a genuine Klipper setup ([The "dirty" Flag and the Team's Position](https://klipper.discourse.group/t/the-dirty-flag-and-the-teams-position/22753/1))? ---
**Author:** ![3dcoded](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/3dcoded/32/20297_2.png) [@3dcoded](https://klipper.discourse.group/u/3dcoded)\ **Post date:** [October 8, 2025, 11:40am UTC](https://klipper.discourse.group/t/exception-in-flush-handler/24976/3 "2025-10-08T11:40:44Z")
Hi @JesNoFear , Please make sure you’ve updated Happy Hare to the latest version with: ```auto cd ~/Happy-Hare ./install.sh ``` There were some relatively recent updates to make it compatible with the new Klipper updates. ---
**Author:** ![JesNoFear](https://avatars.discourse-cdn.com/v4/letter/j/a87d85/32.png) [@JesNoFear](https://klipper.discourse.group/u/JesNoFear)\ **Post date:** [October 8, 2025, 3:01pm UTC](https://klipper.discourse.group/t/exception-in-flush-handler/24976/4 "2025-10-08T15:01:38Z")
Mind you, I am functional. This does seem to be a low rate error that is occuring currently at the beginning of a print. Was just proving feedback in case othere are experiencing issues, or feedback / details on how the new code is working. I’ve been reading the change logs, there was a fair amount of work on this module. ---
**Author:** ![Arksine](https://avatars.discourse-cdn.com/v4/letter/a/ce7236/32.png) [@Arksine](https://klipper.discourse.group/u/Arksine)\ **Post date:** [October 8, 2025, 3:45pm UTC](https://klipper.discourse.group/t/exception-in-flush-handler/24976/5 "2025-10-08T15:45:25Z")
Update your Klipper installation. Kevin recently pushed a patch that fixes potential stepcompress errors. ---
**Author:** ![koconnor](https://avatars.discourse-cdn.com/v4/letter/k/aca169/32.png) [@koconnor](https://klipper.discourse.group/u/koconnor)\ **Post date:** [October 8, 2025, 5:05pm UTC](https://klipper.discourse.group/t/exception-in-flush-handler/24976/6 "2025-10-08T17:05:00Z")
As mentioned above, the upstream Klipper repository had an error (commit b60804bb - applied on September 15th) that was recently fixed (commit c49dbb5a - applied on October 4th). The error could result in sporadic “step compress errors”. It is recommended to update to the latest code to avoid the issue. -Kevin ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [November 8, 2025, 3:05am UTC](https://klipper.discourse.group/t/exception-in-flush-handler/24976/7 "2025-11-08T03:05:08Z")
Closed on November 8, 2025, 3:05am UTC This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.