# ERROR NullPointerException **URL:** \ **Category:** KNIME Analytics Platform\ **Created:** [November 16, 2020, 1:27pm UTC](https://forum.knime.com/t/error-nullpointerexception/28750 "2020-11-16T13:27:43Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Olybones](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/o/3ab097/32.png) [@Olybones](https://forum.knime.com/u/Olybones)\ **Post date:** [November 16, 2020, 1:27pm UTC](https://forum.knime.com/t/error-nullpointerexception/28750/1 "2020-11-16T13:27:43Z")
Hello all, I am pretty new to KNIME. I am getting the ERROR: Loop End 2:206 Caught “NullPointerException”: null - on my Loop. I can´t find anything similiar online. So I hope that somebody could help with that. I’m on Version 4.1.3. Thanks in advance! ---
**Author:** ![ipazin](https://forum-cdn.knime.com/user_avatar/forum.knime.com/ipazin/32/806_2.png) [@ipazin](https://forum.knime.com/u/ipazin)\ **Post date:** [November 16, 2020, 2:08pm UTC](https://forum.knime.com/t/error-nullpointerexception/28750/2 "2020-11-16T14:08:10Z")
Hello @Olybones, and welcome to KNIME Community! Is there a chance you can share more details about workflow that produces this error? Maybe a workflow example where this can be seen? Check here how to create one: > [@Reproducible (Minimal) Workflow Example](https://forum.knime.com/t/reproducible-minimal-workflow-example/24482): > > Hi there KNIMErs! What is this topic about? This topic is about helping yourself and KNIME community! How? By creating and sharing workflow examples that help and can be successfully ran by others wink When? When logic requires it. For example when you are opening a topic in order to get help (you are getting error or can’t configure node and would like someone else to take a look what is wrong; or you started a workflow and got stuck so need help with next step), when you are [reporting …](https://forum.knime.com/t/bug-reporting-best-practices/24451) Br, Ivan ---
**Author:** ![Olybones](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/o/3ab097/32.png) [@Olybones](https://forum.knime.com/u/Olybones)\ **Post date:** [November 16, 2020, 2:56pm UTC](https://forum.knime.com/t/error-nullpointerexception/28750/3 "2020-11-16T14:56:51Z")
![Screenshot 2020-11-16 155145](https://forum-cdn.knime.com/uploads/default/original/3X/1/3/139323a3c055769fbbc98731def7ddd15affce7f.jpeg) ![Screenshot 2020-11-16 155223](https://forum-cdn.knime.com/uploads/default/original/3X/b/1/b176b164a87cc389d8a7c2bea028032773b95cd2.jpeg) As you can see in the Screenshots, I have a Group Loop Start and an End. My data contains around 300k rows. If I filter the data down to around 50k - 100K it works fine. Ass soon as I have it unfiltered it throws me that Error after about an hour of calculating. I hope that helped to understand the topic a little better… Please let me know if you need further information… ---
**Author:** ![ipazin](https://forum-cdn.knime.com/user_avatar/forum.knime.com/ipazin/32/806_2.png) [@ipazin](https://forum.knime.com/u/ipazin)\ **Post date:** [November 20, 2020, 11:13am UTC](https://forum.knime.com/t/error-nullpointerexception/28750/4 "2020-11-20T11:13:34Z")
Hello @Olybones, helped a bit but a workflow where this can be seen would be great because this way I can not reproduce it. If data is confidential try using dummy data. Does this happen with same iteration each time? (That would indicate problem within same group i.e. some data causing this.) Br, Ivan ---
**Author:** ![system](https://forum-cdn.knime.com/uploads/default/original/1X/ab3ccf34482a0329361734a18199390177204f15.png) [@system](https://forum.knime.com/u/system)\ **Post date:** [May 21, 2021, 11:13pm UTC](https://forum.knime.com/t/error-nullpointerexception/28750/5 "2021-05-21T23:13:46Z")
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