Cannot install gimp, undefined method 'major_minor' for nil

### `brew config` AND `brew doctor` output OR `brew gist-logs <formula>` link ```shell $ brew config HOMEBREW_VERSION: 5.1.7 ORIGIN: https://github.com/Homebrew/brew HEAD: 3aae056b8d072624255bc8fd27febb7f327b2265 Last commit: 6 days ago Branch: stable Core tap JSON: 23 Apr 15:52 UTC HOMEBREW_PREFIX: /home/linuxbrew/.linuxbrew HOMEBREW_CASK_OPTS: [] HOMEBREW_DISPLAY: :0 HOMEBREW_DOWNLOAD_CONCURRENCY: 40 HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set HOMEBREW_MAKE_JOBS: 20 Homebrew Ruby: 4.0.2 => /home/linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/4.0.2_1/bin/ruby CPU: 20-core 64-bit alderlake Clang: 22.1.4 Git: 2.53.0 => /bin/git Curl: 8.18.0 => /bin/curl Kernel: Linux 7.0.0-14-generic x86_64 GNU/Linux OS: Ubuntu 26.04 LTS (resolute) Host glibc: 2.43 Host libstdc++: 6.0.35 /usr/bin/gcc: 15.2.0 /usr/bin/ruby: 3.3.8 glibc: N/A gcc@12: N/A gcc: N/A xorg: N/A $ brew doctor Your system is ready to brew. ``` ### Verification - [x] My `brew doctor` output says `Your system is ready to brew.` and am still able to reproduce my issue. - [x] I ran `brew update` and am still able to reproduce my issue. - [x] I have resolved all warnings from `brew doctor` and that did not fix my problem. - [x] I searched for recent similar issues at https://github.com/Homebrew/homebrew-core/issues?q=is%3Aissue and found no duplicates. - [x] My issue is not about a failure to build a formula from source. ### What were you trying to do (and why)? Install gimp. ```sh $ brew update && brew upgrade && brew cleanup $ brew install gimp ==> Fetching downloads for: gimp ✔︎ API Source gimp.rb Verified 1.8KB/ 1.8KB ✔︎ Cask gimp (3.2.4) Verified 244.6MB/244.6MB Error: Cask 'gimp' definition is invalid: undefined method 'major_minor' for nil ``` ### What happened (include all command output)? ``` Error: Cask 'gimp' definition is invalid: undefined method 'major_minor' for nil ``` ### What did you expect to happen? clean installation ### Step-by-step reproduction instructions (by running `brew` commands) ```shell $ brew update && brew upgrade && brew cleanup $ brew install gimp ```