From 5ab043491b7ca54f2feeb479ca5638dbb1a81184 Mon Sep 17 00:00:00 2001
From: Teddy Katz <teddy.katz@gmail.com>
Date: Tue, 29 Aug 2017 03:28:45 -0400
Subject: [PATCH] Fix: indent crash on sparse arrays with "off" option (fixes
 #9157) (#9166)

---
 lib/rules/indent.js       | 11 ++++++++++-
 tests/lib/rules/indent.js |  4 ++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/lib/rules/indent.js b/lib/rules/indent.js
index 8872836f4a4..07aa1e830a3 100644
--- a/lib/rules/indent.js
+++ b/lib/rules/indent.js
@@ -802,10 +802,19 @@ module.exports = {
                 return;
             }
             elements.forEach((element, index) => {
+                if (!element) {
+
+                    // Skip holes in arrays
+                    return;
+                }
                 if (offset === "off") {
+
+                    // Ignore the first token of every element if the "off" option is used
                     offsets.ignoreToken(getFirstToken(element));
                 }
-                if (index === 0 || !element) {
+
+                // Offset the following elements correctly relative to the first element
+                if (index === 0) {
                     return;
                 }
                 if (offset === "first" && tokenInfo.isFirstTokenOfLine(getFirstToken(element))) {
diff --git a/tests/lib/rules/indent.js b/tests/lib/rules/indent.js
index 7ea3c189053..1339c16f642 100644
--- a/tests/lib/rules/indent.js
+++ b/tests/lib/rules/indent.js
@@ -3222,6 +3222,10 @@ ruleTester.run("indent", rule, {
             code: "[,]",
             options: [2, { ArrayExpression: "first" }]
         },
+        {
+            code: "[,]",
+            options: [2, { ArrayExpression: "off" }]
+        },
         {
             code: unIndent`
                 [