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[release 1.18] Forge And OptiFine seem to be incompatible.


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**This issue was also reported to the OptiFine Github Issues page, by myself: https://github.com/sp614x/optifine/issues/6432

Description of Issue

Forge instance is crashing when loading up with OptiFine in the mod folder. From the debug-log I could understand that it tried loading up OptiFine first, but then it ends in an "Unexpected issue occured. Exit Code: 0.".


Steps to Reproduce

1. Download mods in Mod list

2. paste OptiFine and other Mods into the Mods-Folder

3. paste launching Args to the Launching-Argument-Line of the Forge-Profile

4. launch Minecraft

5. game Crashing before showing up.


Minecraft Launching Arguments (+750MB more RAM = -Xmx2750M )

Launching Args: -Xmx2750M -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M


OptiFine Version

OptiFine HD U H3 pre6 (most recent) and the release1.18 versions beforehand


Forge Version

1.18 - 38.0.14 (most recent) and the release1.18 versions beforehand


Other Installed Mods

Catalogue: https://www.curseforge.com/minecraft/mc-mods/catalogue/files/3543625
Configured: https://www.curseforge.com/minecraft/mc-mods/configured/files/3546349
Jade: https://www.curseforge.com/minecraft/mc-mods/jade/files/3544015
Jade-API: https://www.curseforge.com/minecraft/mc-mods/jade/files/3544058


Log Files/Crash Reports

debug-log (versions noted in this bug-report): https://pastebin.com/9J2PWB61
debug-log (versions noted in the pastebin): https://pastebin.com/SKxdcDvJ


F3 Debug Screenshot

I am not entering the main menu at all, in this case I sadly can not include that F3-Debug-Screen-Screenshot


Prior Testing

  • Does this happen without other mods installed?
    • Yes, it does happen, when OptiFine is being launched without any other mods installed.
  • Does this happen without any mods at all?
    • There is no crash occurring, if Forge is launched without any mods installed.
  • Does this happen in OptiFine standalone?
    • No. The standalone version is launching up just fine, as expected.
  • Does this happen in Vanilla without OptiFine?
    • No. The Vanilla 1.18 us launching without any issues.
  • Does this happen in Forge standalone?
    • No. Forge standalone in launching just fine, as expected.
  • Have you tried using a binary search to find which mods cause this issue?


Additional Information


  • No crash reports available because of Exit Code: 0


My Conclusion

Forge and OptiFine seem to be incompatible.

Edited by Motzey
"Does this happen in Forge standalone?" (Prior Testing) and the Screenshot in "Additional Information" was added.
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  • Motzey changed the title to [release 1.18] Forge And OptiFine seem to be incompatible.
2 minutes ago, Luis_ST said:

Optifine has at the moment no compatible version with Forge in 1.18

Thanks for confirming my assumptions. (I was already flamed on the OptiFine-Github for posting this issue because it was already acknowledged beforehand). I just wanted to post this on both pages.

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12 hours ago, Motzey said:

Thanks for confirming my assumptions. (I was already flamed on the OptiFine-Github for posting this issue because it was already acknowledged beforehand). I just wanted to post this on both pages.

New version that works now is out btw.

Edited by Its
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