diff --git a/Civi/Core/AssetBuilder.php b/Civi/Core/AssetBuilder.php
index aa40a097f47a..362fb9ee8729 100644
--- a/Civi/Core/AssetBuilder.php
+++ b/Civi/Core/AssetBuilder.php
@@ -195,7 +195,10 @@ public function build($name, $params, $force = FALSE) {
       }
       catch (UnknownAssetException $e) {
         // unexpected error, log and continue
-        \Civi::log()->error('Unexpected error while rendering a file in the AssetBuilder: ' . $e->getMessage(), ['exception' => $e]);
+        // except during upgrade since this repeatedly logs about l10n for each individual upgrade task
+        if ($e->getMessage() !== 'Unrecognized asset name: crm-l10n.js' || !\CRM_Core_Config::isUpgradeMode()) {
+          \Civi::log()->error('Unexpected error while rendering a file in the AssetBuilder: ' . $e->getMessage(), ['exception' => $e]);
+        }
       }
     }
     return $fileName;