maxbobse opened a new issue, #6800:
URL: https://github.com/apache/hop/issues/6800
### Apache Hop version?
2.17
### Java version?
OpenJDK 64-Bit Server VM Temurin-21.0.3+9 (build 21.0.3+9-LTS, mixed mode,
sharing)
### Operating system
Windows
### What happened?
I get this error when running my pipeline
```
2026/03/17 08:09:33 - transposer - Execution started for pipeline
[transposer]
Exception in thread "Thread-13" java.lang.NullPointerException: Cannot
invoke "String.length()" because the return value of
"org.apache.hop.pipeline.transforms.normaliser.NormaliserField.getValue()" is
null
at
org.apache.hop.pipeline.transforms.normaliser.NormaliserMeta.getFields(NormaliserMeta.java:167)
at
org.apache.hop.pipeline.transform.BaseTransformMeta.getFields(BaseTransformMeta.java:325)
at
org.apache.hop.pipeline.PipelineMeta.getThisTransformFields(PipelineMeta.java:1406)
at
org.apache.hop.pipeline.PipelineMeta.getTransformFields(PipelineMeta.java:1214)
at
org.apache.hop.pipeline.PipelineMeta.getTransformFields(PipelineMeta.java:1108)
at
org.apache.hop.pipeline.PipelineMeta.getTransformFields(PipelineMeta.java:1074)
at
org.apache.hop.pipeline.engines.local.LocalPipelineEngine.addTransformExecutionSamplers(LocalPipelineEngine.java:323)
at
org.apache.hop.pipeline.engines.local.LocalPipelineEngine.prepareExecution(LocalPipelineEngine.java:242)
at
org.apache.hop.ui.hopgui.file.pipeline.HopGuiPipelineGraph.lambda$preparePipeline$17(HopGuiPipelineGraph.java:4699)
at java.base/java.lang.Thread.run(Thread.java:1583)
```
It is triggered because the configuration in the row normaliser was not
complete:
<img width="745" height="765" alt="Image"
src="https://github.com/user-attachments/assets/1d3af092-f995-43f0-b74d-1cf537075728";
/>
Problem here is that the error shows in the console only. In the web GUI,
the pipeline simply stops but no errors are displayed:
<img width="1106" height="838" alt="Image"
src="https://github.com/user-attachments/assets/467f5d22-a1e2-4023-9750-6edcd9117d8f";
/>
No idea if this is a GUI issue because it does not show the error properly
or a code issue due to the missing NULL check.
### Issue Priority
Priority: 3
### Issue Component
Component: Hop Gui
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