Fix #42

Author: RobiNN1

src/Dashboards/Memcached/MemcachedTrait.php

@@ -414,7 +414,11 @@ private function mainDashboard(): string {
         $keys = $this->getAllKeys();
 
         if (isset($_GET['export_btn'])) {
-            Helpers::export($keys, 'memcached_backup', fn (string $key): string => base64_encode($this->memcached->getKey(urldecode($key))));
+            Helpers::export($keys, 'memcached_backup', function (string $key): ?string {
+                $value = $this->memcached->getKey(urldecode($key));
+
+                return $value !== false ? base64_encode($value) : null;
+            });
         }
 
         $paginator = new Paginator($this->template, $keys);

src/Helpers.php

@@ -138,12 +138,17 @@ public static function export(array $keys, string $filename, callable $value, bo
         $json = [];
 
         foreach ($keys as $key) {
+            $val = $value($key['key']);
+            if ($val === null) {
+                continue;
+            }
+
             $ttl = isset($key['info']['ttl']) && is_int($key['info']['ttl']) ? $key['info']['ttl'] : 0;
 
             $json[] = [
                 'key'   => $key['key'],
                 'ttl'   => $ttl === -1 ? 0 : $ttl,
-                'value' => $value($key['key']),
+                'value' => $val,
             ];
         }