From 9669bda81ea0a1a90a648c359c1589ec4a49429d Mon Sep 17 00:00:00 2001
From: Christian Vette <vette.christian@gmail.com>
Date: Mon, 8 Jan 2018 21:52:19 +0100
Subject: [PATCH] BUGFIX: Prevent NullpointerException in
 PrototypeLineMarkerProvider

---
 .../lang/yaml/annotators/PrototypeLineMarkerProvider.java     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/java/de/vette/idea/neos/lang/yaml/annotators/PrototypeLineMarkerProvider.java b/src/main/java/de/vette/idea/neos/lang/yaml/annotators/PrototypeLineMarkerProvider.java
index e4bdc48f..fc55e750 100644
--- a/src/main/java/de/vette/idea/neos/lang/yaml/annotators/PrototypeLineMarkerProvider.java
+++ b/src/main/java/de/vette/idea/neos/lang/yaml/annotators/PrototypeLineMarkerProvider.java
@@ -29,6 +29,7 @@
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.yaml.psi.YAMLDocument;
 import org.jetbrains.yaml.psi.YAMLKeyValue;
+import org.jetbrains.yaml.psi.YAMLMapping;
 
 import java.util.Collection;
 import java.util.List;
@@ -56,7 +57,8 @@ public void collectSlowLineMarkers(@NotNull List<PsiElement> elements, @NotNull
                 continue;
             }
 
-            if (((YAMLKeyValue) el).getParentMapping().getParent() instanceof YAMLDocument) {
+            YAMLMapping parentMapping = ((YAMLKeyValue) el).getParentMapping();
+            if (parentMapping != null && parentMapping.getParent() instanceof YAMLDocument) {
                 String nodeType = ((YAMLKeyValue) el).getKeyText();
                 String[] nodeTypeSplit = nodeType.split(":");