NPE in ProjectRegistryManager

[alexsuter]

Sometimes this happens:

Caused by: java.lang.NullPointerException: Cannot invoke "org.eclipse.core.runtime.IPath.toFile()" because the return value of "org.eclipse.core.resources.IFile.getLocation()" is null
	at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.c(ProjectRegistryManager.java:936)
	at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.readProjectWithDependencies(ProjectRegistryManager.java:904)
	at org.eclipse.m2e.core.internal.project.registry.MavenProjectCache$CacheLine.lambda$1(MavenProjectCache.java:192)
	at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708)
	at org.eclipse.m2e.core.internal.project.registry.MavenProjectCache$CacheLine.getProject(MavenProjectCache.java:191)
	at org.eclipse.m2e.core.internal.project.registry.MavenProjectCache.getMavenProject(MavenProjectCache.java:105)
	at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.lambda$24(ProjectRegistryManager.java:1101)
	at java.base/java.util.Map.computeIfAbsent(Map.java:1066)
	at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.getMavenProject(ProjectRegistryManager.java:1100)
	... 85 more

I can provide a pull request, but I'm not sure what's the solution.

[mickaelistria]

Do you manage to reproduce it deterministically (so that one can debug it)?

[alexsuter]

not so far... :(