diff --git a/api/src/CalDAV.php b/api/src/CalDAV.php
index d230725795..319d116a8c 100644
--- a/api/src/CalDAV.php
+++ b/api/src/CalDAV.php
@@ -2351,7 +2351,8 @@ class CalDAV extends HTTP_WebDAV_Server
 			// do NOT log non-text attachments
 			$this->store_request = $_SERVER['REQUEST_METHOD'] != 'POST' ||
 				!self::isFileUpload() ||
-				substr($_SERVER['CONTENT_TYPE'], 0, 5) == 'text/';
+				substr($_SERVER['CONTENT_TYPE'], 0, 5) == 'text/' ||
+				str_starts_with($_SERVER['CONTENT_TYPE'], 'application/json');
 		}
 		// unconditionally start output-buffering to fix problems with huge multiget reports from TB110 AB
 		ob_start();