From 4aef0f7e017cdf7e2b92dc9a9f700368506879e9 Mon Sep 17 00:00:00 2001
From: Pim van den Berg
Date: Fri, 9 Dec 2016 07:54:21 +0100
Subject: inc/functions: check if $_GET value is empty before executing
 preg_match

When using "canvas" mode, a lot of these errors were thrown:
> Invalid type instance in $_GET["ti"]: ""
> Invalid type instance in $_GET["pi"]: ""

Closes: #132
---
 inc/functions.inc.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/inc/functions.inc.php b/inc/functions.inc.php
index 55807d4..77cbe4b 100644
--- a/inc/functions.inc.php
+++ b/inc/functions.inc.php
@@ -12,7 +12,7 @@ function GET($index = NULL, $value = NULL) {
 		return $arr;
 	}
 
-	if (!isset($_GET[$index]))
+	if (!isset($_GET[$index]) or strlen($_GET[$index]) == 0)
 		return NULL;
 
 	if ($value === NULL)
-- 
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