From ceff2e47a89acd6b5138593dd95ebc51c47cdef2 Mon Sep 17 00:00:00 2001
From: Ryan Cramer <ryan@rc-d.net>
Date: Mon, 12 Mar 2018 10:16:11 -0400
Subject: [PATCH] Fix issue processwire/processwire-issues#523 prevent user
 from uninstalling admin themes defined by `$config->defaultAdminTheme`

---
 wire/core/AdminTheme.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/wire/core/AdminTheme.php b/wire/core/AdminTheme.php
index 0fd64ee5..ce7469b3 100644
--- a/wire/core/AdminTheme.php
+++ b/wire/core/AdminTheme.php
@@ -312,6 +312,14 @@ abstract class AdminTheme extends WireData implements Module {
 	}
 	
 	public function ___uninstall() { 
+	
+		$defaultAdminTheme = $this->wire('config')->defaultAdminTheme;
+		if($defaultAdminTheme == $this->className()) {
+			throw new WireException(
+				"Cannot uninstall this admin theme because \$config->defaultAdminTheme = '$defaultAdminTheme'; " . 
+				"Please add this setting with a different value in /site/config.php"
+			); 
+		}
 
 		/*
 		if(self::$numAdminThemes > 1) return;