From b7c232972e8a3e01a791403fa21957ecd9e83f6b Mon Sep 17 00:00:00 2001
From: Ryan Cramer <ryan@processwire.com>
Date: Thu, 3 Aug 2023 10:58:05 -0400
Subject: [PATCH] Fix issue processwire/processwire-issues#800

---
 .../ProcessPageEditImageSelect.module                      | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/wire/modules/Process/ProcessPageEditImageSelect/ProcessPageEditImageSelect.module b/wire/modules/Process/ProcessPageEditImageSelect/ProcessPageEditImageSelect.module
index 866eac46..90d97923 100644
--- a/wire/modules/Process/ProcessPageEditImageSelect/ProcessPageEditImageSelect.module
+++ b/wire/modules/Process/ProcessPageEditImageSelect/ProcessPageEditImageSelect.module
@@ -707,9 +707,14 @@ class ProcessPageEditImageSelect extends Process implements ConfigurableModule {
 		if(!isset($parts['class']) && $input->get('class')) {
 			$class = $input->get('class'); 
 			if($class) {
-				$validClasses = array($this->alignLeftClass, $this->alignCenterClass, $this->alignRightClass);
+				$validClasses = array_merge(
+					explode(' ', $this->alignLeftClass), 
+					explode(' ', $this->alignCenterClass), 
+					explode(' ', $this->alignRightClass)
+				);
 				$classes = array();
 				foreach(explode(' ', $class) as $c) {
+					if(empty($c)) continue;
 					if(in_array($c, $validClasses)) $classes[] = $c; 
 				}
 				if(count($classes)) $parts['class'] = urlencode(implode(' ' , $classes));