diff --git a/app/javascript/mastodon/features/emoji/__tests__/emoji_index-test.js b/app/javascript/mastodon/features/emoji/__tests__/emoji_index-test.js
index bd63d91b3..9df2d34a0 100644
--- a/app/javascript/mastodon/features/emoji/__tests__/emoji_index-test.js
+++ b/app/javascript/mastodon/features/emoji/__tests__/emoji_index-test.js
@@ -44,7 +44,12 @@ describe('emoji_index', () => {
     expect(emojiIndex.search('apple').map(trimEmojis)).toEqual(expected);
   });
 
-  it('erases custom emoji if not passed again', () => {
+  it('can include/exclude categories', () => {
+    expect(search('flag', { include: ['people'] })).toEqual([]);
+    expect(emojiIndex.search('flag', { include: ['people'] })).toEqual([]);
+  });
+
+  it('(different behavior from emoji-mart) do not erases custom emoji if not passed again', () => {
     const custom = [
       {
         id: 'mastodon',
@@ -60,7 +65,33 @@ describe('emoji_index', () => {
     search('', { custom });
     emojiIndex.search('', { custom });
     const expected = [];
-    expect(search('masto').map(trimEmojis)).toEqual(expected);
+    const lightExpected = [
+      {
+        id: 'mastodon',
+        custom: true,
+      },
+    ];
+    expect(search('masto').map(trimEmojis)).toEqual(lightExpected);
+    expect(emojiIndex.search('masto').map(trimEmojis)).toEqual(expected);
+  });
+
+  it('(different behavior from emoji-mart) erases custom emoji if another is passed', () => {
+    const custom = [
+      {
+        id: 'mastodon',
+        name: 'mastodon',
+        short_names: ['mastodon'],
+        text: '',
+        emoticons: [],
+        keywords: ['mastodon'],
+        imageUrl: 'http://example.com',
+        custom: true,
+      },
+    ];
+    search('', { custom });
+    emojiIndex.search('', { custom });
+    const expected = [];
+    expect(search('masto', { custom: [] }).map(trimEmojis)).toEqual(expected);
     expect(emojiIndex.search('masto').map(trimEmojis)).toEqual(expected);
   });
 
@@ -97,11 +128,6 @@ describe('emoji_index', () => {
       .not.toContain('pineapple');
   });
 
-  it('can include/exclude categories', () => {
-    expect(search('flag', { include: ['people'] })).toEqual([]);
-    expect(emojiIndex.search('flag', { include: ['people'] })).toEqual([]);
-  });
-
   it('does an emoji whose unified name is irregular', () => {
     const expected = [
       {
diff --git a/app/javascript/mastodon/features/emoji/emoji_mart_search_light.js b/app/javascript/mastodon/features/emoji/emoji_mart_search_light.js
index bf511d290..36351ec02 100644
--- a/app/javascript/mastodon/features/emoji/emoji_mart_search_light.js
+++ b/app/javascript/mastodon/features/emoji/emoji_mart_search_light.js
@@ -54,9 +54,13 @@ function addCustomToPool(custom, pool) {
   index = {};
 }
 
-function search(value, { emojisToShowFilter, maxResults, include, exclude, custom = [] } = {}) {
-  if (customEmojisList !== custom)
-    addCustomToPool(custom, originalPool);
+function search(value, { emojisToShowFilter, maxResults, include, exclude, custom } = {}) {
+  if (custom !== undefined) {
+    if (customEmojisList !== custom)
+      addCustomToPool(custom, originalPool);
+  } else {
+    custom = [];
+  }
 
   maxResults = maxResults || 75;
   include = include || [];
diff --git a/yarn.lock b/yarn.lock
index 853e61b37..ba289d5ce 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2305,7 +2305,7 @@ elliptic@^6.0.0:
 
 emoji-mart@Gargron/emoji-mart#build:
   version "2.6.1"
-  resolved "https://codeload.github.com/Gargron/emoji-mart/tar.gz/227c56c8a1cd89a475d4cf8d9605096555e12484"
+  resolved "https://codeload.github.com/Gargron/emoji-mart/tar.gz/829d042f1c059b15050e5acb3c77adf1a851c666"
 
 emoji-regex@^6.1.0:
   version "6.5.1"