Catch error when git fails to read the hash

1 files changed, 3 insertions, 0 deletions

diff --git a/src/luarocks/fetch/git.lua b/src/luarocks/fetch/git.lua
index 2b8adc78..ff66f7fe 100644
--- a/src/luarocks/fetch/git.lua
+++ b/src/luarocks/fetch/git.lua
@@ -55,6 +55,9 @@ local function git_identifier(git_cmd, ver)
       return nil
    end
    local date_hash = util.popen_read(fs.Q(git_cmd).." log --pretty=format:'%ai %h' -n 1")
+   if not date_hash then
+      return nil
+   end
    local date, time, tz, hash = date_hash:match("([^%s]+) ([^%s]+) ([^%s]+) ([^%s]+)")
    date = date:gsub("%-", "")
    time = time:gsub(":", "")