Description of problem: Create a Builder project from this Git repository: https://github.com/Igalia/phpreport Use the tree to open the file web/include/ext.ux.datepickerplus/ext.ux.datepickerplus.js Buidler will immediately crash. Version-Release number of selected component: gnome-builder-3.28.1-1.fc28 Additional info: reporter: libreport-2.9.5 backtrace_rating: 4 cmdline: /usr/bin/gnome-builder --gapplication-service crash_function: update_syntax executable: /usr/bin/gnome-builder journald_cursor: s=2f23d0246e824d0daac882a41d66d731;i=2bf43;b=cc0cf63e9ee74ebf9882e02185e98653;m=67ab25ae5;t=56ba010d8d567;x=7f297065581cd8f5 kernel: 4.16.5-300.fc28.x86_64 rootdir: / runlevel: N 5 type: CCpp uid: 1000
Created attachment 1432700 [details] File: backtrace
Created attachment 1432701 [details] File: cgroup
Created attachment 1432702 [details] File: core_backtrace
Created attachment 1432703 [details] File: cpuinfo
Created attachment 1432704 [details] File: dso_list
Created attachment 1432705 [details] File: environ
Created attachment 1432706 [details] File: limits
Created attachment 1432707 [details] File: maps
Created attachment 1432708 [details] File: mountinfo
Created attachment 1432709 [details] File: open_fds
Created attachment 1432710 [details] File: proc_pid_status
Please test with latest updates and reopen if still reproducible.
Still reproducible after update to 3.28.4-1.fc28.
Forwarded to upstream: https://gitlab.gnome.org/GNOME/gnome-builder/issues/588 Let's continue there.