fix for cache blowing up

Signed-off-by: Andy Miller <rhuk@mac.com>

CHANGELOG.md

@@ -3,6 +3,7 @@
 
 1. [](#bugfix)
     * Deferred Extension support in Forked version of Twig 3
+    * Fix for cache blowing up when upgrading from 1.7 to 1.8
 
 # v1.8.0-beta.4
 ## 01/27/2025

system/src/Grav/Common/Cache.php

@@ -537,8 +537,17 @@ class Cache extends Getters
 
         // Delete entries in the doctrine cache if required
         if (in_array($remove, ['all', 'standard'])) {
-            $cache = Grav::instance()['cache'];
-            $cache->driver->deleteAll();
+            try {
+                $grav = Grav::instance();
+                if ($grav->offsetExists('cache')) {
+                    $cache = $grav['cache'];
+                    if (isset($cache->driver)) {
+                        $cache->driver->deleteAll();
+                    }
+                }
+            } catch (\Throwable $e) {
+                $output[] = 'cache: ' . $e->getMessage();
+            }
         }
 
         // Clearing cache event to add paths to clear