diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
index d8cab35..874bfe8 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
@@ -511,7 +511,10 @@
 		}
 
 		private static void write(Path p, String body) throws IOException {
-			FileUtils.mkdirs(p.getParent().toFile(), true);
+			Path parent = p.getParent();
+			if (parent != null) {
+				FileUtils.mkdirs(parent.toFile(), true);
+			}
 			try (Writer w = new OutputStreamWriter(Files.newOutputStream(p),
 					UTF_8)) {
 				w.write(body);