diff --git a/index.js b/index.js
index af5fe8ba..4f6cc52a 100644
--- a/index.js
+++ b/index.js
@@ -831,19 +831,24 @@ var QUERIES = [
       }
       var usage = context.customUsage
       return Object.keys(usage).reduce(function (result, version) {
+        var percentage = usage[version]
+        if (percentage == null) {
+          return result
+        }
+
         if (sign === '>') {
-          if (usage[version] > popularity) {
+          if (percentage > popularity) {
             result.push(version)
           }
         } else if (sign === '<') {
-          if (usage[version] < popularity) {
+          if (percentage < popularity) {
             result.push(version)
           }
         } else if (sign === '<=') {
-          if (usage[version] <= popularity) {
+          if (percentage <= popularity) {
             result.push(version)
           }
-        } else if (usage[version] >= popularity) {
+        } else if (percentage >= popularity) {
           result.push(version)
         }
         return result
@@ -866,19 +871,24 @@ var QUERIES = [
       }
       var usage = context.customUsage
       return Object.keys(usage).reduce(function (result, version) {
+        var percentage = usage[version]
+        if (percentage == null) {
+          return result
+        }
+
         if (sign === '>') {
-          if (usage[version] > popularity) {
+          if (percentage > popularity) {
             result.push(version)
           }
         } else if (sign === '<') {
-          if (usage[version] < popularity) {
+          if (percentage < popularity) {
             result.push(version)
           }
         } else if (sign === '<=') {
-          if (usage[version] <= popularity) {
+          if (percentage <= popularity) {
             result.push(version)
           }
-        } else if (usage[version] >= popularity) {
+        } else if (percentage >= popularity) {
           result.push(version)
         }
         return result
@@ -897,19 +907,24 @@ var QUERIES = [
       env.loadCountry(browserslist.usage, place, browserslist.data)
       var usage = browserslist.usage[place]
       return Object.keys(usage).reduce(function (result, version) {
+        var percentage = usage[version]
+        if (percentage == null) {
+          return result
+        }
+
         if (sign === '>') {
-          if (usage[version] > popularity) {
+          if (percentage > popularity) {
             result.push(version)
           }
         } else if (sign === '<') {
-          if (usage[version] < popularity) {
+          if (percentage < popularity) {
             result.push(version)
           }
         } else if (sign === '<=') {
-          if (usage[version] <= popularity) {
+          if (percentage <= popularity) {
             result.push(version)
           }
-        } else if (usage[version] >= popularity) {
+        } else if (percentage >= popularity) {
           result.push(version)
         }
         return result
diff --git a/test/and.test.js b/test/and.test.js
index 2391cab7..c00dd97f 100644
--- a/test/and.test.js
+++ b/test/and.test.js
@@ -1,5 +1,5 @@
 let { test } = require('uvu')
-let { is, equal } = require('uvu/assert')
+let { equal } = require('uvu/assert')
 let { join } = require('path')
 
 delete require.cache[require.resolve('..')]
@@ -36,7 +36,7 @@ test('query composition with AND operator', () => {
 })
 
 test('correctly works with not and one-version browsers as AND query', () => {
-  is(browserslist('last 1 Baidu version and not <2% in AT').length, 0)
+  equal(browserslist('last 1 Baidu version and not <2% in AT'), ['baidu 7.12'])
 })
 
 test('reads config from package.json', () => {
diff --git a/test/country.test.js b/test/country.test.js
index bcb20169..4f03001e 100644
--- a/test/country.test.js
+++ b/test/country.test.js
@@ -9,6 +9,7 @@ let originUsage = browserslist.usage
 test.before.each(() => {
   browserslist.usage = {
     US: {
+      'chrome 999': null, // unreleased
       'ie 8': 1,
       'ie 9': 5,
       'ie 10': 10.1,
diff --git a/test/fixtures/stats.json b/test/fixtures/stats.json
index 62d4cd0c..a8353ce2 100644
--- a/test/fixtures/stats.json
+++ b/test/fixtures/stats.json
@@ -10,7 +10,8 @@
       "34": 0.2,
       "35": 0.7,
       "36": 2.3,
-      "37": 3.5
+      "37": 3.5,
+      "999": null
     }
   }
 }
diff --git a/test/main.test.js b/test/main.test.js
index e02d610a..b313d634 100644
--- a/test/main.test.js
+++ b/test/main.test.js
@@ -257,7 +257,7 @@ test('uses production environment by default', () => {
 })
 
 test('correctly works with not and one-version browsers', () => {
-  is(browserslist('last 1 Baidu version, not <2% in AT').length, 0)
+  equal(browserslist('last 1 Baidu version, not <2% in AT'), ['baidu 7.12'])
 })
 
 test.run()
diff --git a/test/shareable-stats.test.js b/test/shareable-stats.test.js
index 9b9b750a..918432ce 100644
--- a/test/shareable-stats.test.js
+++ b/test/shareable-stats.test.js
@@ -47,6 +47,15 @@ test('takes stats and queries from shareable config', async () => {
   equal(browserslist('extends browserslist-config-test2'), ['ie 11'])
 })
 
+test('ignores null usage value', async () => {
+  await mock(
+    'browserslist-config-null-test',
+    undefined,
+    { chrome: { 90: 3, 999: null } }
+  )
+  equal(browserslist('< 5% in browserslist-config-null-test stats'), ['chrome 90'])
+})
+
 test('works with non-prefixed stats with dangerousExtend', async () => {
   await mock('pkg', undefined, { chrome: { 78: 6 } })
   equal(