Adding file_exists check in install/index.php

install/index.php

@@ -8,13 +8,21 @@ $db_file_path = $db_config_path."database.php";
 function delDir($dir) {
 	$files = glob( $dir . '*', GLOB_MARK );
     foreach ( $files as $file ) {
-        if( substr( $file, -1 ) == '/' )
+        if ( substr( $file, -1 ) == '/' ) {
+			if (file_exists($file)) {
             	delDir( $file );
-        else
+			}
+		} else {
+			if (file_exists($file)) {
 				unlink( $file );
 			}
+		}
+    }
+	// This step may be not needed
+    if (file_exists($dir)) {
 		rmdir( $dir );
 	}
+}
 
 if (file_exists($db_file_path)) {
 	delDir(getcwd());