args-out-of-range error when running gnus-search with nested topics

[Julien Cubizolles]

I'm getting the following error when running
gnus-group-read-ephemeral-search-group on the top topic node (named BAL
in the following excerpt of the layout) but not when running it on any
of its children nodes.

--8<---------------cut here---------------start------------->8---
  [ BALs -- 2348 ]
    [ FreeOffline -- 426 ]
         171|13:  Inbox
          22|40:  General
          15| 0:  sorties
*          0| 1:  loisirs
          28| 6:  alire
*          0| 1:  SMS
*          0|11:  anciens
*          0| 1:  logeais
         190|99:  muspy
*          0| 1:  achats
    [ GmailOffline -- 24 ]
--8<---------------cut here---------------end--------------->8---

Here are the last lines from the backtrace :

--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (args-out-of-range 
[["nnmaildir+Academie:capytale" 249 100] ["nnmaildir+Academie:capytale" 297 
100] ["nnmaildir+Academie:capytale" 327 100] ["nnmaildir+Academie:capytale" 385 
100] ["nnmaildir+Free:Call log" 607 100] ["nnmaildir+Free:Call log" 608 100] 
["nnmaildir+Free:Call log" 662 100] ["nnmaildir+Free:Call log" 1044 100] 
["nnmaildir+Free:Call log" 1062 100] ["nnmaildir+Free:Inbox" 450 100] 
["nnmaildir+Free:Inbox" 542 100] ["nnmaildir+Free:Inbox" 549 100] 
["nnmaildir+Free:Inbox" 618 100] ["nnmaildir+Free:Inbox" 619 100] 
["nnmaildir+Free:Inbox" 626 100] ["nnmaildir+Free:Inbox" 627 100] 
["nnmaildir+Free:Inbox" 629 100] ["nnmaildir+Free:Inbox" 673 100] 
["nnmaildir+Free:Inbox" 695 100] ["nnmaildir+Free:Inbox" 710 100] 
["nnmaildir+Free:Inbox" 813 100] ["nnmaildir+Free:Inbox" 819 100] 
["nnmaildir+Free:Inbox" 882 100] ["nnmaildir+Free:Inbox" 1049 100] 
["nnmaildir+Free:Inbox" 1092 100] ["nnmaildir+Free:SMS" 21629 100] 
["nnmaildir+Free:SMS" 21701 100] ["nnmaildir+Free:SMS" 31537 100] 
["nnmaildir+Free:SMS" 31539 100] ["nnmaildir+Free:SMS" 47544 100] 
["nnmaildir+Free:SMS" 47557 100] ["nnmaildir+Free:achats" 272 100] 
["nnmaildir+Free:anciens" 129 100] ["nnmaildir+Free:anciens" 221 100] 
["nnmaildir+Free:capytale" 34 100] ["nnmaildir+Free:capytale" 38 100] 
["nnmaildir+Free:capytale" 45 100] ["nnmaildir+Free:capytale" 74 100] 
["nnmaildir+Free:capytale" 190 100] ["nnmaildir+Free:capytale" 230 100] 
["nnmaildir+Free:capytale" 232 100] ["nnmaildir+Free:capytale" 264 100] 
["nnmaildir+Free:capytale" 266 100] ["nnmaildir+Free:enfants" 235 100] 
["nnmaildir+Free:enfants" 364 100] ["nnmaildir+Free:enfants" 401 100] 
["nnmaildir+Free:enfants" 579 100] ["nnmaildir+Free:enfants" 814 100] 
["nnmaildir+Free:enfants" 1029 100] ["nnmaildir+Free:enfants" 1103 100] 
["nnmaildir+Free:enfants" 1110 100] ["nnmaildir+Free:enfants" 1185 100] 
["nnmaildir+Free:enfants" 1186 100] ["nnmaildir+Free:enfants" 1195 100] 
["nnmaildir+Free:enfants" 1311 100] ["nnmaildir+Free:enfants" 1324 100] 
["nnmaildir+Free:enfants" 1361 100]] 57)
  #f(compiled-function (member) #<bytecode 0x1f9de50b86b7a33b>)(58)
  nnselect-retrieve-headers((1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 
47 48 49 50 51 52 53 54 55 56 57 58) "nnselect-87sf42nwy5.fsf" 
"nnselect-ephemeral" nil)
--8<---------------cut here---------------end--------------->8---

-- 
Julien Cubizolles