diff --git a/inc/CalDAVRequest.php b/inc/CalDAVRequest.php
index b373689c..8be428f3 100644
--- a/inc/CalDAVRequest.php
+++ b/inc/CalDAVRequest.php
@@ -1124,7 +1124,7 @@ EOSQL;
     @header( sprintf("X-DAViCal-Version: DAViCal/%d.%d.%d; DB/%d.%d.%d", $c->code_major, $c->code_minor, $c->code_patch, $c->schema_major, $c->schema_minor, $c->schema_patch) );
     @header( "Content-type: ".$content_type );
 
-    if ( (isset($c->dbg['ALL']) && $c->dbg['ALL']) || (isset($c->dbg['response']) && $c->dbg['response']) ) {
+    if ( (isset($c->dbg['ALL']) && $c->dbg['ALL']) || (isset($c->dbg['response']) && $c->dbg['response']) || $status > 399 ) {
       $lines = headers_list();
       dbg_error_log( "LOG ", "***************** Response Header ****************" );
       foreach( $lines AS $v ) {