From 0b86a3bea474a764b42df90a04c22e788a3a49ef Mon Sep 17 00:00:00 2001
From: anstarovoyt <andrey.starovoyt@jetbrains.com>
Date: Thu, 25 Oct 2018 17:12:58 +0300
Subject: [PATCH] platform: validate files in
 FileReferenceSet#toFileSystemItems

---
 .../resolve/reference/impl/providers/FileReferenceSet.java      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/platform/analysis-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/FileReferenceSet.java b/platform/analysis-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/FileReferenceSet.java
index 39a868ec3369..a00d9ca7d93a 100644
--- a/platform/analysis-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/FileReferenceSet.java
+++ b/platform/analysis-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/FileReferenceSet.java
@@ -469,7 +469,7 @@ public class FileReferenceSet {
   @NotNull
   protected Collection<PsiFileSystemItem> toFileSystemItems(@NotNull Collection<VirtualFile> files) {
     final PsiManager manager = getElement().getManager();
-    return ContainerUtil.mapNotNull(files, (NullableFunction<VirtualFile, PsiFileSystemItem>)file -> file != null ? manager.findDirectory(file) : null);
+    return ContainerUtil.mapNotNull(files, (NullableFunction<VirtualFile, PsiFileSystemItem>)file -> file != null && file.isValid() ? manager.findDirectory(file) : null);
   }
 
   protected Condition<PsiFileSystemItem> getReferenceCompletionFilter() {