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Problem: tagfunc failed in a weird buffer (either a directory or some other non-file buffer, I don't remember): E987: Invalid return value from tagfunc E5108: Error executing lua …/runtime/lua/vim/lsp/util.lua:311: EISDIR: illegal operation on a directory stack traceback: at this line: local data = assert(uv.fs_read(fd, stat.size, 0)) Solution: Check for directory.