# Paraview 6.0.1 crashed when applying the "Merge Blocks" filter.
**URL:** https://discourse.paraview.org/t/paraview-6-0-1-crashed-when-applying-the-merge-blocks-filter/17369
**Category:** ParaView Support
**Tags:** vtk
**Created:** [December 12, 2025, 11:04am UTC](https://discourse.paraview.org/t/paraview-6-0-1-crashed-when-applying-the-merge-blocks-filter/17369 "2025-12-12T11:04:58Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@m41m41\_Ann](https://discourse.paraview.org/u/m41m41_Ann)
#### Post date: [December 12, 2025, 11:04am UTC](https://discourse.paraview.org/t/paraview-6-0-1-crashed-when-applying-the-merge-blocks-filter/17369/1 "2025-12-12T11:04:58Z")
Applying the “Merge Blocks” filter to the file causes a crash. Could there be a problem with the data in the test file?
**Operating steps** : Open Paraview, drag and drop this CGNS file into Paraview, apply, add the ‘Merge Block’ filter, apply. The program crashes.
**Note** : The probability of it not crashing is very low, and no pattern has been found.
**Version** : macOS (M-chip), ParaView 6.0.1
**Test file:**
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 12, 2025, 12:25pm UTC](https://discourse.paraview.org/t/paraview-6-0-1-crashed-when-applying-the-merge-blocks-filter/17369/2 "2025-12-12T12:25:54Z")
Indeed, I confirm the issue, but it is already fixed in master and will be available in 6.1
You can try the nightly here: [https://www.paraview.org/download/?version=nightly](https://www.paraview.org/download/?version=nightly)
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### Author:  [@m41m41\_Ann](https://discourse.paraview.org/u/m41m41_Ann)
#### Post date: [December 12, 2025, 3:57pm UTC](https://discourse.paraview.org/t/paraview-6-0-1-crashed-when-applying-the-merge-blocks-filter/17369/3 "2025-12-12T15:57:15Z")
Yes, Nightly build is OK.
Thanks