From b44669397a7bef4dcaf58e9d5d665a432cc5212a Mon Sep 17 00:00:00 2001
From: Ryan Cramer <ryan@processwire.com>
Date: Wed, 15 Apr 2020 16:37:09 -0400
Subject: [PATCH] Fix issue processwire/processwire-issues#1119

---
 wire/core/Sanitizer.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wire/core/Sanitizer.php b/wire/core/Sanitizer.php
index 39e81487..e68cf3b2 100644
--- a/wire/core/Sanitizer.php
+++ b/wire/core/Sanitizer.php
@@ -459,7 +459,7 @@ class Sanitizer extends Wire {
 		if(ctype_alpha($value) && strlen($value) <= $maxLength) return $value; // simple 1-word attributes
 
 		// remove any non ":_a-zA-Z" characters from beginning of attribute name
-		while(strpos(":_$this->alphaASCII", substr($value, 0, 1)) === false && strlen($value)) {
+		while(strlen($value) && strpos(":_$this->alphaASCII", substr($value, 0, 1)) === false) {
 			$value = substr($value, 1); 
 		}