diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index 72b2017..e1e1bf1 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -926,6 +926,24 @@ function! s:ConfigTimestamps(dir, dict) abort
   return join(map(files, 'getftime(expand(v:val))'), ',')
 endfunction
 
+function! s:ConfigCallback(r, into) abort
+  let dict = a:into[1]
+  let lines = a:r.exit_status ? [] : split(tr(join(a:r.stdout, "\1"), "\1\n", "\n\1"), "\1", 1)[0:-2]
+  for line in lines
+    let key = matchstr(line, "^[^\n]*")
+    if !has_key(dict, key)
+      let dict[key] = []
+    endif
+    if len(key) ==# len(line)
+      call add(dict[key], 1)
+    else
+      call add(dict[key], strpart(line, len(key) + 1))
+    endif
+  endfor
+  lockvar! dict
+  let a:into[0] = s:ConfigTimestamps(dict.git_dir, dict)
+endfunction
+
 let s:config_prototype = {}
 
 let s:config = {}
@@ -959,38 +977,25 @@ function! fugitive#Config(...) abort
     let dir = s:Dir()
   endif
   let name = substitute(name, '^[^.]\+\|[^.]\+$', '\L&', 'g')
-  let dir_key = len(dir) ? dir : '_'
-  if has_key(s:config, dir_key) && s:config[dir_key][0] ==# s:ConfigTimestamps(dir, s:config[dir_key][1])
-    let dict = s:config[dir_key][1]
-  else
+  let git_dir = s:GitDir(dir)
+  let dir_key = len(git_dir) ? git_dir : '_'
+  let [ts, dict] = get(s:config, dir_key, ['new', {}])
+  if ts !=# s:ConfigTimestamps(git_dir, dict)
     let dict = copy(s:config_prototype)
-    let dict.git_dir = s:GitDir(dir)
-    let [lines, message, exec_error] = s:NullError([dir, 'config', '--list', '-z', '--'])
-    if exec_error
-      return {}
-    endif
-    for line in lines
-      let key = matchstr(line, "^[^\n]*")
-      if !has_key(dict, key)
-        let dict[key] = []
-      endif
-      if len(key) ==# len(line)
-        call add(dict[key], 1)
-      else
-        call add(dict[key], strpart(line, len(key) + 1))
-      endif
-    endfor
-    let s:config[dir_key] = [s:ConfigTimestamps(dir, dict), dict]
-    lockvar! dict
+    let dict.git_dir = git_dir
+    let into = ['running', dict]
+    let exec = fugitive#Execute([dir, 'config', '--list', '-z', '--'], function('s:ConfigCallback'), into)
+    call fugitive#Wait(exec)
+    let s:config[dir_key] = into
   endif
   if exists('callback')
     call call(callback[0], [dict] + callback[1:-1])
   endif
-  return len(name) ? get(get(dict, name, []), 0, default) : dict
+  return len(name) ? get(fugitive#ConfigGetAll(name, dict), 0, default) : dict
 endfunction
 
 function! fugitive#ConfigGetAll(name, ...) abort
-  if a:0 && (type(a:name) !=# type('') || (a:name !~# '^[[:alnum:]-]\+\.' && a:1 =~# '^[[:alnum:]-]\+\.'))
+  if a:0 && (type(a:name) !=# type('') || a:name !~# '^[[:alnum:]-]\+\.' && type(a:1) ==# type('') && a:1 =~# '^[[:alnum:]-]\+\.')
     let config = fugitive#Config(a:name)
     let name = a:1
   else
@@ -998,7 +1003,7 @@ function! fugitive#ConfigGetAll(name, ...) abort
     let name = a:name
   endif
   let name = substitute(name, '^[^.]\+\|[^.]\+$', '\L&', 'g')
-  return copy(get(config, name, []))
+  return name =~# '\.' ? copy(get(config, name, [])) : []
 endfunction
 
 function! fugitive#ConfigGetRegexp(pattern, ...) abort
@@ -1025,11 +1030,7 @@ endfunction
 
 function! s:config_GetAll(name) dict abort
   let name = substitute(a:name, '^[^.]\+\|[^.]\+$', '\L&', 'g')
-  if name =~# '\.'
-    return get(self, name, [])
-  else
-    return []
-  endif
+  return name =~# '\.' ? copy(get(self, name, [])) : []
 endfunction
 
 function! s:config_Get(name, ...) dict abort