From 9b97e06ef69b7961f342c9ee8468c552c9b503a3 Mon Sep 17 00:00:00 2001
From: Bogdan Chadkin <trysound@yandex.ru>
Date: Sun, 21 Feb 2021 14:50:55 +0300
Subject: [PATCH] Fix empty <svg /> in cleanupIDs plugin

---
 plugins/cleanupIDs.js | 2 +-
 test/svgo/_index.js   | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/plugins/cleanupIDs.js b/plugins/cleanupIDs.js
index 71ffb5f9..bf541d13 100644
--- a/plugins/cleanupIDs.js
+++ b/plugins/cleanupIDs.js
@@ -65,7 +65,7 @@ exports.fn = function(data, params) {
                 }
 
                 // Don't remove IDs if the whole SVG consists only of defs.
-                if (item.isElem('svg')) {
+                if (item.isElem('svg') && item.content) {
                     var hasDefsOnly = true;
 
                     for (var j = 0; j < item.content.length; j++) {
diff --git a/test/svgo/_index.js b/test/svgo/_index.js
index b6c708a4..6eb0f558 100644
--- a/test/svgo/_index.js
+++ b/test/svgo/_index.js
@@ -57,4 +57,8 @@ describe('svgo', () => {
     expect(result.error).to.match(/Error in parsing SVG/);
     expect(result.path).to.equal('input.svg');
   });
+  it('should handle empty svg tag', async () => {
+    const result = optimize('<svg />', { input: 'file', path: 'input.svg' });
+    expect(result.data).to.equal('<svg/>');
+  });
 });