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NullPointerException on File indexing (IgnoreFilesIndex), infinite loop of failing re-indexes.

See original GitHub issue

Prerequisites

Plugin is in the latest version
Issue was not reported yet
Stack trace (if provided) contains mobi.hsz.idea.gitignore package name

Description

Infinite loops of index runs (every ~10 sec), each accompanied with the following log entries:

2018-04-04 10:02:51,358 [ 165995] INFO - il.indexing.FileBasedIndexImpl - Rebuild requested for index IgnoreFilesIndex
java.lang.NullPointerException
at com.intellij.util.indexing.impl.ValueContainerImpl.saveTo(ValueContainerImpl.java:410)
at com.intellij.util.indexing.impl.ChangeTrackingValueContainer.saveTo(ChangeTrackingValueContainer.java:174)
at com.intellij.util.indexing.impl.ValueContainerMap$1.append(ValueContainerMap.java:58)
at com.intellij.util.io.PersistentHashMap.doAppendData(PersistentHashMap.java:481)
at com.intellij.util.io.PersistentHashMap.appendData(PersistentHashMap.java:458)
at com.intellij.util.indexing.impl.ValueContainerMap.doPut(ValueContainerMap.java:55)
at com.intellij.util.indexing.impl.ValueContainerMap.doPut(ValueContainerMap.java:28)
at com.intellij.util.io.PersistentHashMap.put(PersistentHashMap.java:377)
at com.intellij.util.indexing.impl.MapIndexStorage$3.onDropFromCache(MapIndexStorage.java:132)
at com.intellij.util.indexing.impl.MapIndexStorage$3.onDropFromCache(MapIndexStorage.java:99)
at com.intellij.util.containers.SLRUMap.clear(SLRUMap.java:148)
at com.intellij.util.indexing.impl.MapIndexStorage.flush(MapIndexStorage.java:156)
at com.intellij.util.indexing.VfsAwareMapIndexStorage.flush(VfsAwareMapIndexStorage.java:106)
at com.intellij.util.indexing.MemoryIndexStorage.flush(MemoryIndexStorage.java:127)
at com.intellij.util.indexing.impl.MapReduceIndex.doFlush(MapReduceIndex.java:148)
at com.intellij.util.indexing.VfsAwareMapReduceIndex.doFlush(VfsAwareMapReduceIndex.java:192)
at com.intellij.util.indexing.impl.MapReduceIndex.flush(MapReduceIndex.java:127)
at com.intellij.util.indexing.FileBasedIndexImpl.a(FileBasedIndexImpl.java:600)
at com.intellij.util.indexing.FileBasedIndexImpl.access$4600(FileBasedIndexImpl.java:117)
at com.intellij.util.indexing.FileBasedIndexImpl$FileIndexDataInitialization$1.run(FileBasedIndexImpl.java:2443)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at com.intellij.util.concurrency.SchedulingWrapper$MyScheduledFutureTask.run(SchedulingWrapper.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Steps to Reproduce

Update .ignore Plugin to latest version (2.5)
Open any Project in PHPStorm

Expected behavior: Index runs once, then finishes, as nothing changed

Actual behavior: Infinite index reruns (every ~10 sec)

Reproduces how often: 100%

Versions

Plugin: 2.5

IDE: PHPStorm 2018.1 / 2017.3.6

OS: macOS 10.13.3 / 10.13.4

Additional Information

Removing .ignore Plugin and manual reinstall of version 2.4 ~~fixed the index problem.~~ does not fix the problem completely, but the NullPointerException with subsequent index rebuild occurs only occasionally.

idea.log