Global gitignore is not indexable

Prerequisites

[x] Plugin is in the latest version
[x] Issue was not reported yet (#186 has different stacktrace)
[x] Stack trace (if provided) contains mobi.hsz.idea.gitignore package name

Description

Since a recent update I get errors logged that my global .gitignore file (which excludes .idea for example) is un-indexable. Restarting or cache invalidation has been tried unsuccessfully.

Error while indexing /home/joshua/.gitignore
To reindex this file IDEA has to be restarted

java.lang.IllegalStateException: psiFile is null. language = Git, substitutedLanguage = Git
    at com.intellij.util.indexing.FileContentImpl.createFileFromText(FileContentImpl.java:151)
    at com.intellij.util.indexing.FileContentImpl.createFileFromText(FileContentImpl.java:140)
    at com.intellij.util.indexing.FileContentImpl.getFileFromText(FileContentImpl.java:108)
    at com.intellij.util.indexing.FileContentImpl.getPsiFileForPsiDependentIndex(FileContentImpl.java:276)
    at com.intellij.util.indexing.FileContentImpl.getPsiFile(FileContentImpl.java:96)
    at mobi.hsz.idea.gitignore.indexing.IgnoreFilesIndex.map(IgnoreFilesIndex.java:86)
    at mobi.hsz.idea.gitignore.indexing.IgnoreFilesIndex.map(IgnoreFilesIndex.java:59)
    at com.intellij.util.indexing.impl.MapReduceIndex.mapInput(MapReduceIndex.java:313)
    at com.intellij.util.indexing.VfsAwareMapReduceIndex.mapInput(VfsAwareMapReduceIndex.java:108)
    at com.intellij.util.indexing.impl.MapReduceIndex.calculateUpdateData(MapReduceIndex.java:269)
    at com.intellij.util.indexing.impl.MapReduceIndex.update(MapReduceIndex.java:251)
    at com.intellij.util.indexing.FileBasedIndexImpl.updateSingleIndex(FileBasedIndexImpl.java:1673)
    at com.intellij.util.indexing.FileBasedIndexImpl.lambda$doIndexFileContent$28(FileBasedIndexImpl.java:1603)
    at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.freezeFileTypeTemporarilyIn(FileTypeManagerImpl.java:634)
    at com.intellij.util.indexing.FileBasedIndexImpl.doIndexFileContent(FileBasedIndexImpl.java:1562)
    at com.intellij.util.indexing.FileBasedIndexImpl.indexFileContent(FileBasedIndexImpl.java:1549)
    at com.intellij.util.indexing.UnindexedFilesUpdater.lambda$indexFiles$0(UnindexedFilesUpdater.java:109)
    at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.lambda$run$0(CacheUpdateRunner.java:219)
    at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1106)
    at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.lambda$run$1(CacheUpdateRunner.java:235)
    at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:169)
    at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:591)
    at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:537)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:59)
    at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:156)
    at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.run(CacheUpdateRunner.java:232)
    at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:294)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)

Steps to Reproduce

Have a global .gitignore
Use this plugin
Load a project with git support enabled

Expected behavior:

.gitignore being indexed and applied to project like colored path nodes in the project view

Actual behavior:

Error logs are stated by PhpStorm that it is not working with my global .gitignore (as stated above). Local .gitignore still works fine.

Reproduces how often:

100%

Versions

Plugin:

3.2.1.192

IDE:

PhpStorm 2019.2
Build #PS-192.5728.108, built on July 24, 2019
Runtime version: 11.0.3+12-b304.10 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 4.4.0-159-generic
GC: ParNew, ConcurrentMarkSweep
Memory: 906M
Cores: 4
Registry: run.processes.with.pty=TRUE
Non-Bundled Plugins: PlantUML integration, String Manipulation, com.github.gtache.lsp, com.intellij.ideolog, de.yannik_sc.java.intelli_j.plugins.unitize, mobi.hsz.idea.gitignore, net.seesharpsoft.intellij.plugins.csv, com.dmarcotte.handlebars, com.jetbrains.lang.ejs, com.kalessil.phpStorm.phpInspectionsEA, de.espend.idea.laravel, de.espend.idea.php.annotation, net.king2500.plugins.PhpAdvancedAutoComplete, fr.adrienbrault.idea.symfony2plugin, de.espend.idea.shopware, org.psliwa.idea.composer, ru.adelf.idea.dotenv

OS:

Linux 4.4.0-159-generic #187-Ubuntu SMP Thu Aug 1 16:28:06 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

My global .gitignore. Filename changed for github. gitignore.txt

JetBrains / idea-gitignore