no value set for FileSourceRootQuery(FileId(6196))

[Veykril]

thread 'LspServer' panicked at D:\a\rust-analyzer\rust-analyzer\crates\salsa\src\input.rs:91:32:
no value set for FileSourceRootQuery(FileId(6196))
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library\std\src\panicking.rs:647
   1: core::panicking::panic_fmt
             at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library\core\src\panicking.rs:72
   2: <salsa::input::InputStorage<Q> as salsa::plumbing::QueryStorageOps<Q>>::fetch
   3: <DB as base_db::SourceDatabaseExt>::file_source_root
   4: base_db::change::FileChange::apply
   5: hir_expand::change::ChangeWithProcMacros::apply
   6: ide_db::apply_change::<impl ide_db::RootDatabase>::apply_change
   7: rust_analyzer::global_state::GlobalState::new
   8: rust_analyzer::main_loop::<impl rust_analyzer::global_state::GlobalState>::run
   9: rust_analyzer::main_loop::<impl rust_analyzer::global_state::GlobalState>::run
  10: rust_analyzer::main_loop::main_loop
  11: rust_analyzer::run_server
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

run into this when checking out a very old revision and then rebasing that on master