Version 4.7.0

system/Image/Gd.php

@@ -407,7 +407,7 @@ class _Gd extends \IPS\Image
 	{
 		$extensions = static::$imageExtensions;
 
-		if( isset( gd_info()['WebP Support'] ) and gd_info()['WebP Support'] )
+		if( isset( gd_info()['WebP Support'] ) and gd_info()['WebP Support'] and version_compare( PHP_VERSION, '7.3.0' ) >= 0 )
 		{
 			$extensions[] = 'webp';
 		}