diff --git a/htdocs/blockedlog/admin/blockedlog_list.php b/htdocs/blockedlog/admin/blockedlog_list.php
index 5cb5d47b1b35d..eb831fb06b815 100644
--- a/htdocs/blockedlog/admin/blockedlog_list.php
+++ b/htdocs/blockedlog/admin/blockedlog_list.php
@@ -647,8 +647,9 @@
 
 			// Fingerprint
 			print '<td class="nowraponall">';
+			// Note: the previous line id is not necessarily id-1, so in texttoshow we say "on previous line" without giving id to avoid a search/fetch to get previous id.
 			$texttoshow = $langs->trans("Fingerprint").' - '.$langs->trans("SavedOnLine").' =<br>'.$block->signature;
-			$texttoshow .= '<br><br>'.$langs->trans("Fingerprint").' - Recalculated sha256('.$langs->trans("PreviousHash").' on line '.($block->id - 1).' + data) =<br>'.$checkdetail[$block->id]['calculatedsignature'];
+			$texttoshow .= '<br><br>'.$langs->trans("Fingerprint").' - Recalculated sha256('.$langs->trans("PreviousHash").' on previous line + data) =<br>'.$checkdetail[$block->id]['calculatedsignature'];
 			$texttoshow .= '<br><span class="opacitymedium">'.$langs->trans("PreviousHash").'='.$checkdetail[$block->id]['previoushash'].'</span>';
 			//$texttoshow .= '<br>keyforsignature='.$checkdetail[$block->id]['keyforsignature'];
 			print $form->textwithpicto(dol_trunc($block->signature, 8), $texttoshow, 1, 'help', '', 0, 2, 'fingerprint'.$block->id);