Ticket #40017: exif.diff

src/wp-includes/functions.php

@@ -2367 +2367 @@
          */
         try {
                 if ( is_callable( 'exif_imagetype' ) ) {
-                        $mime = image_type_to_mime_type( exif_imagetype( $file ) );
+                        $imagetype = exif_imagetype( $file );
+                        $mime = ( false !== $imagetype ) ? image_type_to_mime_type( $imagetype ) : false;
                 } elseif ( function_exists( 'getimagesize' ) ) {
                         $imagesize = getimagesize( $file );
                         $mime = ( isset( $imagesize['mime'] ) ) ? $imagesize['mime'] : false;