If the expiration is null, then set it permanently when increments. (#…

…24228)

src/Illuminate/Cache/FileStore.php

@@ -91,7 +91,7 @@ public function increment($key, $value = 1)
         $raw = $this->getPayload($key);
 
         return tap(((int) $raw['data']) + $value, function ($newValue) use ($key, $raw) {
-            $this->put($key, $newValue, $raw['time']);
+            $this->put($key, $newValue, $raw['time'] ?? 0);
         });
     }