if(! isset($this->filename)){
$notEnclosureMimeTypes = array(null,'text/html','application/xhtml+xml');
- $mimetype = strtolower($this->mimetype);
+ if($mimetype != null){
+ $mimetype = strtolower($this->mimetype);
+ }
$semicolon = strpos($mimetype,';');
if($semicolon){
$mimetype = substr($mimetype,0,$semicolon);