Desktop UI crashes on load with `Cannot read properties of undefined (reading 'id')` in session bundle

[cyberprophet]

Summary

I hit the same crash twice today on OpenCode Desktop/Web UI startup. The app shows the black "Something went wrong" screen before the main UI finishes loading.

Version

• OpenCode: 1.2.20

Actual Behavior

The app crashes during load with:

TypeError: Cannot read properties of undefined (reading id)
    at Object.fn (http://127.0.0.1:4096/assets/session-CiCXhYTR.js:14:79062)
    at Mk (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:6835)
    at Pl (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:6592)
    at op (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:8002)
    at D6 (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:8883)
    at pL (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:8255)
    at qr (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:8187)
    at http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:5043

The crash screen text is:

Something went wrong
An error occurred while loading the application.

Expected Behavior

If session data is missing or malformed, the app should handle it gracefully instead of crashing the entire UI during startup.

Frequency

• Happened twice today

Notes

• This looks related to session bootstrap/rendering because the top frame is in assets/session-*.js.
• There is already #11702 about runtime crashes from unsafe assumptions, but this report is a user-facing UI crash on 1.2.20 with a concrete startup stack trace.
• I have a screenshot of the error screen and can add it in a follow-up comment if that helps.

[cyberprophet]

[cyberprophet]

TypeError: Cannot read properties of undefined (reading 'state')
    at c (http://127.0.0.1:4096/assets/session-CiCXkYTR.js:14:76803)
    at get metadata (http://127.0.0.1:4096/assets/session-CiCXkYTR.js:14:77783)
    at s (http://127.0.0.1:4096/assets/session-CiCXkYTR.js:14:83444)
    at Object.fn (http://127.0.0.1:4096/assets/session-CiCXkYTR.js:14:83669)
    at Mk (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:6835)
    at Pl (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:6592)
    at op (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:8002)
    at D6 (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:8883)
    at pL (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:8255)
    at qr (http://127.0.0.1:4096/assets/index-jLZvC0f3.js:2:8187)

[franBec]

just happened to me on the web UI, but if I quickly change to a different project as soon as it starts everything is fine. Maybe has something to do with what I was working before restarting the PC

screenshot of working just fine on a random project I didnt even open yesterday

what happens when going to my most recent project

TypeError: Cannot read properties of undefined (reading 'length')
    at Object.fn (http://127.0.0.1:4096/assets/session-Cg8YeoLd.js:14:50663)
    at Mk (http://127.0.0.1:4096/assets/index-Dl3PGFdp.js:2:6835)
    at Pl (http://127.0.0.1:4096/assets/index-Dl3PGFdp.js:2:6592)
    at Object._6 (http://127.0.0.1:4096/assets/index-Dl3PGFdp.js:2:5606)
    at get style (http://127.0.0.1:4096/assets/session-Cg8YeoLd.js:14:51075)
    at jL (http://127.0.0.1:4096/assets/index-Dl3PGFdp.js:2:24146)
    at Object.fn (http://127.0.0.1:4096/assets/index-Dl3PGFdp.js:2:23793)
    at Mk (http://127.0.0.1:4096/assets/index-Dl3PGFdp.js:2:6835)
    at Pl (http://127.0.0.1:4096/assets/index-Dl3PGFdp.js:2:6592)
    at Oe (http://127.0.0.1:4096/assets/index-Dl3PGFdp.js:2:1831)

my setup

          ▗▄▄▄       ▗▄▄▄▄    ▄▄▄▖             pollito@Lenovo-ideapad-L340-15IRH
          ▜███▙       ▜███▙  ▟███▛             ---------------------------------
           ▜███▙       ▜███▙▟███▛              OS: NixOS 25.11 (Xantusia) x86_64
            ▜███▙       ▜██████▛               Host: 81LK (IdeaPad L340-15IRH G)
     ▟█████████████████▙ ▜████▛     ▟▙         Kernel: Linux 6.12.62
    ▟███████████████████▙ ▜███▙    ▟██▙        Uptime: 4 mins
           ▄▄▄▄▖           ▜███▙  ▟███▛        Packages: 1998 (nix-system), 128)
          ▟███▛             ▜██▛ ▟███▛         Shell: zsh 5.9
         ▟███▛               ▜▛ ▟███▛          Display (BOE0700): 1920x1080 @ 1]
▟███████████▛                  ▟██████████▙    DE: Cinnamon 6.4.13
▜██████████▛                  ▟███████████▛    WM: Muffin (X11)
      ▟███▛ ▟▙               ▟███▛             WM Theme: Adapta-Nokto (Mint-Y)
     ▟███▛ ▟██▙             ▟███▛              Theme: Mint-Y-Dark-Aqua [GTK2/3/]
    ▟███▛  ▜███▙           ▝▀▀▀▀               Icons: Mint-Y-Aqua [GTK2/3/4]
    ▜██▛    ▜███▙ ▜██████████████████▛         Font: JetBrainsMono Nerd Font (1]
     ▜▛     ▟████▙ ▜████████████████▛          Cursor: Bibata-Modern-Classic (2)
           ▟██████▙       ▜███▙                Terminal: alacritty 0.16.1
          ▟███▛▜███▙       ▜███▙               Terminal Font: JetBrainsMono Ner)
         ▟███▛  ▜███▙       ▜███▙              CPU: Intel(R) Core(TM) i7-9750H z
         ▝▀▀▀    ▀▀▀▀▘       ▀▀▀▘              GPU 1: NVIDIA GeForce GTX 1650 M]
                                               GPU 2: Intel UHD Graphics 630 @ ]
                                               Memory: 1.52 GiB / 15.49 GiB (10)
                                               Swap: 0 B / 24.78 GiB (0%)
                                               Disk (/): 159.02 GiB / 450.62 Gi4

[jon23d]

I have multiple different servers on different ubuntu VMs that are all doing this today. Switching the hostname that I use to access the application appears to fix it, until I open up the project.

[tobeycodes]

This is happening for me but I have not updated opencode (currently on 1.2.15) so it is slightly odd opencode web is auto updating and running 1.2.20

[bxb1337]

This is happening for me, on 1.2.19 and 1.2.20. Same error output

[yhdev7935]

guys have you used gpt 5.4 model? i got the same err

[jon23d]

I uninstalled and reinstalled opencode, and it continues happening as soon as I begin a new session in the web ui. I wonder if there isn't some aggressive time-change stuff going on in there.

[bxb1337]

guys have you used gpt 5.4 model? i got the same err

I use.

[ajinkyaT]

Same issue here, updated to the latest version 1.2.25 still not resolving it.