# NPE when use sameDiff.nn.dropout

**URL:** <https://community.konduit.ai/t/npe-when-use-samediff-nn-dropout/1885>\
**Category:** SameDiff\
**Created:** [May 30, 2022, 7:53am UTC](https://community.konduit.ai/t/npe-when-use-samediff-nn-dropout/1885 "2022-05-30T07:53:23Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![SidneyLann](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/sidneylann/32/367_2.png) [@SidneyLann](https://community.konduit.ai/u/SidneyLann)\
**Post date:** [May 30, 2022, 7:53am UTC](https://community.konduit.ai/t/npe-when-use-samediff-nn-dropout/1885/1 "2022-05-30T07:53:23Z")

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java.lang.NullPointerException: Cannot invoke “org.nd4j.linalg.api.ndarray.INDArray.shape()” because the return value of “org.nd4j.autodiff.samediff.SDVariable.getArr()” is null  
at org.nd4j.linalg.api.ops.random.BaseRandomOp.(BaseRandomOp.java:51) ~[nd4j-api-1.0.0-M2.jar:na]  
at org.nd4j.linalg.api.ops.random.impl.DropOutInverted.(DropOutInverted.java:47) ~[nd4j-api-1.0.0-M2.jar:na]  
at org.nd4j.autodiff.samediff.ops.SDNN.dropoutInverted(SDNN.java:265) ~[nd4j-api-1.0.0-M2.jar:na]

Had anyone used sameDiff.nn.dropoutInverted()? Above error occurs. Same problem when using sameDiff.nn.dropout()

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<div class="post-metadata">

**Author:** ![agibsonccc](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/agibsonccc/32/697_2.png) [@agibsonccc](https://community.konduit.ai/u/agibsonccc)\
**Post date:** [May 30, 2022, 7:55am UTC](https://community.konduit.ai/t/npe-when-use-samediff-nn-dropout/1885/2 "2022-05-30T07:55:41Z")

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@SidneyLann mind filing an issue? This should be an easy fix.

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<div class="post-metadata">

**Author:** ![SidneyLann](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/sidneylann/32/367_2.png) [@SidneyLann](https://community.konduit.ai/u/SidneyLann)\
**Post date:** [May 30, 2022, 9:11am UTC](https://community.konduit.ai/t/npe-when-use-samediff-nn-dropout/1885/3 "2022-05-30T09:11:24Z")

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Ok, will file an issue.