From 1d3d075e3587f939e81e324e09ac6fedfe1a8839 Mon Sep 17 00:00:00 2001
From: Struan Donald <struan@exo.org.uk>
Date: Wed, 4 Dec 2024 12:15:12 +0000
Subject: [PATCH] fix alert criteria parsing if only a single quoted phrase

was adding a space to the front because explode was always returning an
array with one entry.
---
 classes/Utility/Alert.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/classes/Utility/Alert.php b/classes/Utility/Alert.php
index fc85dccef8..6e87183132 100644
--- a/classes/Utility/Alert.php
+++ b/classes/Utility/Alert.php
@@ -104,7 +104,10 @@ public static function prettifyCriteria($alert_criteria, $as_parts = false) {
                 $alert_criteria = trim(preg_replace('/ +/', ' ', str_replace($phrases[0], "", $alert_criteria)));
 
                 # and then create an array with the words and phrases
-                $criteria = explode(' ', $alert_criteria);
+                $criteria = [];
+                if ( $alert_criteria != "") {
+                    $criteria = explode(' ', $alert_criteria);
+                }
                 $criteria = array_merge($criteria, $phrases[1]);
             } else {
                 $criteria = explode(' ', $alert_criteria);