# NPE opening diff view with LightVirtualFile

**URL:** https://platform.jetbrains.com/t/npe-opening-diff-view-with-lightvirtualfile/2821
**Category:** IntelliJ Platform
**Created:** [September 27, 2025, 5:52am UTC](https://platform.jetbrains.com/t/npe-opening-diff-view-with-lightvirtualfile/2821 "2025-09-27T05:52:16Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![m.sciachero](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/m.sciachero/32/245_2.png) [@m.sciachero](https://platform.jetbrains.com/u/m.sciachero)
#### Post date: [September 27, 2025, 5:52am UTC](https://platform.jetbrains.com/t/npe-opening-diff-view-with-lightvirtualfile/2821/1 "2025-09-27T05:52:16Z")

</div>

Hi all,

I’ve the following exception when I open a DiffViewer using lightweight file:

```auto
2025-09-27 13:45:53,440 [260140] SEVERE - #c.i.c.d.i.PassExecutorService - getOriginalFile(...) must not be null
java.lang.NullPointerException: getOriginalFile(...) must not be null
	at org.jetbrains.kotlin.idea.util.FileUtils.getOriginalOrDelegateFile(FileUtils.kt:34)
	at org.jetbrains.kotlin.idea.fir.extensions.KtCompilerPluginsProviderIdeImpl.getRegisteredExtensions(KtCompilerPluginsProviderIdeImpl.kt:155)
	at org.jetbrains.kotlin.analysis.low.level.api.fir.projectStructure.SessionFactoryHelpersKt.registerCompilerPluginExtensions(sessionFactoryHelpers.kt:97)
	at org.jetbrains.kotlin.analysis.low.level.api.fir.sessions.LLFirAbstractSessionFactory.createScriptSession(LLFirAbstractSessionFactory.kt:161)
	at org.jetbrains.kotlin.analysis.low.level.api.fir.sessions.LLFirSessionCache.createSession(LLFirSessionCache.kt:128)
	at org.jetbrains.kotlin.analysis.low.level.api.fir.sessions.LLFirSessionCache.access$createSession(LLFirSessionCache.kt:28)
	at org.jetbrains.kotlin.analysis.low.level.api.fir.sessions.LLFirSessionCache$getSession$1.invoke(LLFirSessionCache.kt:60)
	at org.jetbrains.kotlin.analysis.low.level.api.fir.sessions.LLFirSessionCache$getSession$1.invoke(LLFirSessionCache.kt:60)

```

The file is created in this way:

```auto
LightVirtualFile(
                file.url,
                file.fileType,
                String(file.contentsToByteArray(), file.charset),
                file.charset,
                file.modificationStamp,
            )

```

Not sure how to pass the originalFile to a LightVirtualFile (I assumed should be used when a virtual file is not available.

Any suggestion?

Thanks a lot in advance.

Intellij version I found it:

> IntelliJ IDEA 2025.2 (Community Edition)  
> Build #IC-252.23892.409, built on August 1, 2025  
> Source revision: 0a9a69b3f9332  
> Runtime version: 21.0.7+6-b1038.58 amd64 (JCEF 122.1.9)  
> VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.  
> Toolkit: sun.awt.wl.WLToolkit  
> Linux 6.16.8-200.fc42.x86\_64  
> Fedora Linux 42 (KDE Plasma Desktop Edition); glibc: 2.41  
> Kotlin analyzer version: 2.2.20-dev-5812  
> GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation  
> Memory: 2048M  
> Cores: 16  
> Registry:  
> ide.experimental.ui=true  
> llm.show.ai.promotion.window.on.start=false  
> Non-Bundled Plugins:  
> com.gitlab.msciachero.intellij-gitlab-plugin (13.1.0-SNAPSHOT+002)  
> Kotlin: 252.23892.409-IJ  
> Current Desktop: KDE

---

<div class="post-metadata">

### Author: ![ilia.shulgin](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/ilia.shulgin/32/2653_2.png) [@ilia.shulgin](https://platform.jetbrains.com/u/ilia.shulgin)
#### Post date: [October 3, 2025, 7:17am UTC](https://platform.jetbrains.com/t/npe-opening-diff-view-with-lightvirtualfile/2821/3 "2025-10-03T07:17:51Z")

</div>

Hello @m.sciachero. The problem is on the IntelliJ side, and was fixed in 252.26199 and later builds

---

<div class="post-metadata">

### Author: ![m.sciachero](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/m.sciachero/32/245_2.png) [@m.sciachero](https://platform.jetbrains.com/u/m.sciachero)
#### Post date: [October 4, 2025, 5:42am UTC](https://platform.jetbrains.com/t/npe-opening-diff-view-with-lightvirtualfile/2821/4 "2025-10-04T05:42:40Z")

</div>

Thanks a lot, in any case I switch back to my custom implementation of Virtual File (as mirror of remote repository), but good to know that I can move back to LightVirtualFile if I have trouble with my implementation.