diff --git a/htdocs/public/agenda/agendaexport.php b/htdocs/public/agenda/agendaexport.php
index 54726aefc83..11bb1520ff0 100644
--- a/htdocs/public/agenda/agendaexport.php
+++ b/htdocs/public/agenda/agendaexport.php
@@ -95,20 +95,32 @@ if (empty($conf->global->MAIN_AGENDA_XCAL_EXPORTKEY))
 	exit;
 }
 
-// Check exportkey
-if (empty($_GET["exportkey"]) || $conf->global->MAIN_AGENDA_XCAL_EXPORTKEY != $_GET["exportkey"])
-{
-	$user->getrights();
-
-	llxHeaderVierge();
-	print '<div class="error">Bad value for key.</div>';
-	llxFooterVierge();
-	exit;
-}
-
 // Initialize technical object to manage hooks. Note that conf->hooks_modules contains array of hooks
 $hookmanager->initHooks(array('agendaexport'));
 
+$reshook = $hookmanager->executeHooks('doActions', $filters); // Note that $action and $object may have been modified by some
+if ($reshook < 0){
+	llxHeaderVierge();
+	if(!empty($hookmanager->errors) && is_array($hookmanager->errors)){
+		print '<div class="error">'.implode('<br/>', $hookmanager->errors).'</div>';
+	}else{
+		print '<div class="error">'.$hookmanager->error.'</div>';
+	}
+	llxFooterVierge();
+}
+elseif(empty($reshook)) {
+	// Check exportkey
+	if (empty($_GET["exportkey"]) || $conf->global->MAIN_AGENDA_XCAL_EXPORTKEY != $_GET["exportkey"]) {
+		$user->getrights();
+
+		llxHeaderVierge();
+		print '<div class="error">Bad value for key.</div>';
+		llxFooterVierge();
+		exit;
+	}
+}
+
+
 // Define filename with prefix on filters predica (each predica set must have on cache file)
 $shortfilename='dolibarrcalendar';
 $filename=$shortfilename;