Scrolling on Waybar causes it to crash and reload

[Teemsploit]

When I scroll on Waybar it crashes and reloads I ran it through the terminal to get the error message here are the errors from two separate runs.

** (waybar:4363): ERROR **: 11:47:56.469: 
unhandled exception (type std::exception) in signal handler:
what: in Json::Value::find(begin, end): requires objectValue or nullValue

[1]    4363 trace trap (core dumped)  waybar

** (waybar:4125): ERROR **: 11:47:43.844: 
unhandled exception (type std::exception) in signal handler:
what: in Json::Value::find(begin, end): requires objectValue or nullValue

[1]    4125 trace trap (core dumped)  waybar

To make sure it wasn’t just an issue on my end I asked someone else who mentioned having a similar issue to test it and they got the same error message.

** (waybar:5249): ERROR **: 11:42:39.231: 
unhandled exception (type std::exception) in signal handler:
what: in Json::Value::find(begin, end): requires objectValue or nullValue

I assume Waybar 14.0 introduced a regression it assumes scroll events are always defined in the JSON config.

[danielgccr]

I noticed the same issue today with Arch Linux, but in this case, the bug only happens in some places of Waybar (the expanders, in fact), as the place shown below in the Jsonc config file:

"group/tray-expander": {
    "orientation": "inherit",
    "drawer": {
      "transition-duration": 600,
      "children-class": "tray-group-item"
    },
    "modules": [
      "custom/expand-icon",
    "tray"
    ]
  },

Once happened, I have to relaunch it manually with hyprctl dispatch exec waybar. The log is the following:

** (waybar:317118): ERROR **: 10:13:03.428:
unhandled exception (type std::exception) in signal handler:
what: in Json::Value::find(begin, end): requires objectValue or nullValue

Trace/breakpoint trap      (core dumped) waybar

Versions:

Waybar version: v0.14.0
Hyprland version: 0.50.1
Kernel version: 6.15.9-arch1-1

[93og]

Also experiencing this on Arch.

waybar 0.14.0-1
hyprland 0.50.1-1
linux 6.16.1.arch1-1

Downgraded to waybar 0.13.0-3 for the time being.

I suspect it has to do more with the "group" modules than the drawers, as I am getting this crash when I scroll on groups without drawers as well.

[BinaryHarbinger]

Mee too. Scrolling on some components (power-profiles-daemon, mpris, some custom buttons, CPU, memory etc...) Causes waybar to crash.

[2025-08-21 22:57:22.115] [info] Using configuration file /home/efe/.config/waybar/config
[2025-08-21 22:57:22.117] [info] Discovered appearance 'dark'
[2025-08-21 22:57:22.138] [info] Using CSS file /home/efe/.config/waybar/style.css
[2025-08-21 22:57:22.144] [info] Hyprland IPC starting
[2025-08-21 22:57:22.144] [info] Loading persistent workspaces from Waybar config
[2025-08-21 22:57:22.145] [info] Loading persistent workspaces from Hyprland workspace rules
[2025-08-21 22:57:22.300] [info] Bar configured (width: 1920, height: 31) for output: DP-1
[2025-08-21 22:57:22.300] [error] Item '': No icon name or pixmap given.
[2025-08-21 22:57:22.311] [error] Item '': No icon name or pixmap given.

** (waybar:661142): WARNING **: 22:57:22.311: Status Notifier Item with bus name ':1.39' and object path '/org/ayatana/NotificationItem/tuxedo_control_center1' is already registered

** (waybar:661142): WARNING **: 22:57:23.517: Status Notifier Item with bus name ':1.39' and object path '/org/ayatana/NotificationItem/tuxedo_control_center1' is already registered

** (waybar:661142): ERROR **: 22:57:24.156: 
unhandled exception (type std::exception) in signal handler:
what: in Json::Value::find(begin, end): requires objectValue or nullValue

fish: Job 1, 'waybar' terminated by signal SIGTRAP (Trace or breakpoint trap)

• waybar 0.14.0-1
• hyprland 50.1-1
• Linux 6.16.1-zen1-1-zen

[ChiroTruong]

same here

** (waybar:4785): ERROR **: 08:06:17.555:
unhandled exception (type std::exception) in signal handler:
what: in Json::Value::find(begin, end): requires objectValue or nullValue

[1] 4785 trace trap (core dumped) waybar

• Waybar v0.14.0
• Hyprland 0.50.1
• Linux 6.16.2-zen1-1-zen

[katrushenkov]

same here

** (waybar:145731): ERROR **: 12:51:36.162: 
unhandled exception (type std::exception) in signal handler:
what: in Json::Value::find(begin, end): requires objectValue or nullValue

zsh: trace trap (core dumped)  waybar

Waybar v0.14.0 (branch 'master')
Hyprland 0.50.0 
Linux core 6.16.3-zen1-1-zen

[kromsam]

add this to groups and modules with undefined on-scroll events for a quick fix

// fix scroll-crash
    "on-scroll-up": "true",
    "on-scroll-down": "true"

[KamiKarsten]

I tested the bug a bit, even after this workaround by @kromsam. I encountered the same issue with groups. I think it's not only the scrolling. If I scroll without moving the mouse, it doesn't crash. However, right after the next action—moving the mouse or scrolling again—it crashes.

[pattydaone]

I'd like to add as this was not mentioned: attempting to scroll while the cursor is on the border of a group also triggers the crash.

[Frodojj]

Note that the following also stops the crashes it on my system when using the mouse wheel when scrolling with all modules (even not-expanding ones):

"on-scroll-up": "",
"on-scroll-down": ""

Waybar v0.14.0

[Teemsploit]

I'd like to add as this was not mentioned: attempting to scroll while the cursor is on the border of a group also triggers the crash.

Oh, you're right and at least from my quick test it happens consistently as well that is weird.

[Eonoire]

I'm getting the crash as well. the fix by kromsam didn't fix it for me either. Has there been any progress made on this?

[horhenaniB55]

Bug fixed or not? I have the same issue

[katrushenkov]

I have the same issue too. Even with "on-scroll-up": "","on-scroll-down": "" configured at every custom module. Waybar still crashes when scrolling modules background.