From 422aeff7ac447bdccda79408152fdcf868cca606 Mon Sep 17 00:00:00 2001
From: Ryan Cramer <ryan@processwire.com>
Date: Mon, 10 May 2021 08:41:21 -0400
Subject: [PATCH] Fix issue processwire/processwire-issues#1380

---
 wire/modules/Process/ProcessTemplate/ProcessTemplate.module | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wire/modules/Process/ProcessTemplate/ProcessTemplate.module b/wire/modules/Process/ProcessTemplate/ProcessTemplate.module
index 53e2cef5..e768a2bd 100644
--- a/wire/modules/Process/ProcessTemplate/ProcessTemplate.module
+++ b/wire/modules/Process/ProcessTemplate/ProcessTemplate.module
@@ -3357,7 +3357,7 @@ class ProcessTemplate extends Process implements ConfigurableModule {
 				if($removeTag && $template->hasTag($removeTag)) {
 					$template->removeTag($removeTag);
 				}
-				if(in_array($template->name, $tagTemplates)) {
+				if(is_array($tagTemplates) && in_array($template->name, $tagTemplates)) {
 					// template should have the given tag
 					if($template->hasTag($saveTag)) continue;
 					$template->addTag($saveTag);