diff --git a/autoload/SpaceVim/custom.vim b/autoload/SpaceVim/custom.vim
index 1c26c5a0e..3d7968c68 100644
--- a/autoload/SpaceVim/custom.vim
+++ b/autoload/SpaceVim/custom.vim
@@ -106,6 +106,8 @@ function! SpaceVim#custom#apply(config, type) abort
         call call(bootstrap_before, [])
       catch
         call SpaceVim#logger#error('failed to call bootstrap_before function: ' . bootstrap_before)
+        call SpaceVim#logger#error('       exception: ' . v:exception)
+        call SpaceVim#logger#error('       throwpoint: ' . v:throwpoint)
       endtry
     endif
   endif