# Null List Problem

**URL:** <https://forum.dynamobim.com/t/null-list-problem/13840>\
**Category:** Revit\
**Created:** [August 8, 2017, 9:04pm UTC](https://forum.dynamobim.com/t/null-list-problem/13840 "2017-08-08T21:04:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Joe1](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/joe1/32/27963_2.png) [@Joe1](https://forum.dynamobim.com/u/Joe1)\
**Post date:** [August 8, 2017, 9:04pm UTC](https://forum.dynamobim.com/t/null-list-problem/13840/1 "2017-08-08T21:04:04Z")

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Hello my dear friends  
I installed Dynamo last version (1.3.1) and i have a problem with some lists, these are nulls but Dynamo doesn’t assign null to them (shown in uploaded image) and i can’t convert them to 0 with list.ReplaceNull code. what should i do? Anyone can help me?  
thank you very much!

 ![New Bitmap Image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/5/4/5499301454e0cc9ac10692aa165d0422140c3c7a.jpg)

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**Author:** ![Vikram\_Subbaiah](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/vikram_subbaiah/32/50797_2.png) [@Vikram\_Subbaiah](https://forum.dynamobim.com/u/Vikram_Subbaiah)\
**Post date:** [August 8, 2017, 11:00pm UTC](https://forum.dynamobim.com/t/null-list-problem/13840/2 "2017-08-08T23:00:54Z")

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@Joe1 These aren’t nulls. They are empty strings ![20170808-3](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex022/uploads/dynamobim/original/3X/e/e/eef14254953696735a4ce8b675b21383ef219e1f.png)

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<div class="post-metadata">

**Author:** ![Joe1](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/joe1/32/27963_2.png) [@Joe1](https://forum.dynamobim.com/u/Joe1)\
**Post date:** [August 8, 2017, 11:11pm UTC](https://forum.dynamobim.com/t/null-list-problem/13840/3 "2017-08-08T23:11:52Z")

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thanks dear vikram