| CARVIEW |
Select Language
HTTP/2 200
date: Sat, 19 Jul 2025 13:21:22 GMT
content-type: text/html; charset=utf-8
cf-ray: 961a85817aa1a8b0-BLR
cf-cache-status: DYNAMIC
cache-control: private
set-cookie: prov=892ede92-2e42-4ccd-bdd9-df149b9f9d81; expires=Sun, 19 Jul 2026 13:21:22 GMT; domain=.stackoverflow.com; path=/; secure; httponly
strict-transport-security: max-age=31536000; includeSubDomains
vary: Accept-Encoding
content-security-policy: upgrade-insecure-requests; frame-ancestors 'self' https://stackexchange.com
feature-policy: microphone 'none'; speaker 'none'
x-frame-options: SAMEORIGIN
x-request-guid: 06d0c947-d769-49b2-a3ee-5687d161fa43
x-worker-origin-response-time: 300000000
x-dns-prefetch-control: off
set-cookie: __cflb=02DiuFA7zZL3enAQJD3AX8ZzvyzLcaG7vhF1baiSozVgQ; SameSite=Lax; path=/; expires=Sun, 20-Jul-25 12:21:22 GMT; HttpOnly
set-cookie: prov=892ede92-2e42-4ccd-bdd9-df149b9f9d81; Path=/; HttpOnly; Domain=stackoverflow.com
set-cookie: __cf_bm=YLkCZ4B5wNymZC0ks8.Y065QSrV3hVmaWPU8bQRHsJs-1752931282-1.0.1.1-9ojNj2BaQcNOTjeBJ3K6UrjXetKsm1AfwDJvjctdp.5hwgk3GI1BY8ZBFxxo75Bnf399X6yK4gVPnHFoT82vPhnKHkq1vJkpzYIU8fZDtIw; path=/; expires=Sat, 19-Jul-25 13:51:22 GMT; domain=.stackoverflow.com; HttpOnly; Secure; SameSite=None
set-cookie: _cfuvid=HZhdCp.nRvfghlxB1_ArjBbjoAZFBGRG2LrT9d64y3g-1752931282476-0.0.1.1-604800000; path=/; domain=.stackoverflow.com; HttpOnly; Secure; SameSite=None
server: cloudflare
content-encoding: gzip
User error_null_pointer - Stack Overflow
Skip to main content
Stack Overflow
- Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers
- Advertising Reach devs & technologists worldwide about your product, service or employer brand
- Knowledge Solutions Data licensing offering for businesses to build and improve AI tools and models
- Labs The future of collective knowledge sharing
- About the company Visit the blog
Collectives™ on Stack Overflow
Find centralized, trusted content and collaborate around the technologies you use most.
Learn more about CollectivesTeams
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
Learn more about TeamsStats
455
reputation
79k
reached
3
answers
19
questions
Loading…
About
I have built software with: C#, SQL, C++, C, Python, SQL, Haskell, Java, R, and more. My best languages are currently Haskell and R.
I really enjoy playing with data visualization, and web scraping.
Badges
View all badges
1
gold badge
-
Famous QuestionAug 18, 2014
6
silver badges
-
Good QuestionJul 16, 2019
-
Yearling
× 2Sep 27, 2022 -
Notable Question
× 3Jun 16, 2021
22
bronze badges
-
InvestorMar 5, 2017
-
BenefactorOct 20, 2014
-
PromoterOct 13, 2014
Top tags
View all tags