diff --git a/lib/dialects/abstract/query-generator.js b/lib/dialects/abstract/query-generator.js
index c9793a45693e..e6e9e02df1a4 100644
--- a/lib/dialects/abstract/query-generator.js
+++ b/lib/dialects/abstract/query-generator.js
@@ -156,7 +156,7 @@ class QueryGenerator {
         fields.push(this.quoteIdentifier(key));
 
         // SERIALS' can't be NULL in postgresql, use DEFAULT where supported
-        if (modelAttributeMap && modelAttributeMap[key] && modelAttributeMap[key].autoIncrement === true && !value) {
+        if (modelAttributeMap && modelAttributeMap[key] && modelAttributeMap[key].autoIncrement === true && value == null) {
           if (!this._dialect.supports.autoIncrement.defaultValue) {
             fields.splice(-1, 1);
           } else if (this._dialect.supports.DEFAULT) {
@@ -276,7 +276,8 @@ class QueryGenerator {
           this._dialect.supports.bulkDefault
           && serials[key] === true
         ) {
-          return fieldValueHash[key] || 'DEFAULT';
+          // fieldValueHashes[key] ?? 'DEFAULT'
+          return fieldValueHash[key] != null ? fieldValueHash[key] : 'DEFAULT';
         }
 
         return this.escape(fieldValueHash[key], fieldMappedAttributes[key], { context: 'INSERT' });
diff --git a/test/unit/sql/insert.test.js b/test/unit/sql/insert.test.js
index 34b09acdaf27..c9ba66b98e9e 100644
--- a/test/unit/sql/insert.test.js
+++ b/test/unit/sql/insert.test.js
@@ -36,6 +36,26 @@ describe(Support.getTestDialectTeaser('SQL'), () => {
         });
 
     });
+
+    it('allow insert primary key with 0', () => {
+      const M = Support.sequelize.define('m', {
+        id: {
+          type: DataTypes.INTEGER,
+          primaryKey: true,
+          autoIncrement: true
+        }
+      });
+
+      expectsql(sql.insertQuery(M.tableName, { id: 0 }, M.rawAttributes),
+        {
+          query: {
+            mssql: 'SET IDENTITY_INSERT [ms] ON; INSERT INTO [ms] ([id]) VALUES ($1); SET IDENTITY_INSERT [ms] OFF;',
+            postgres: 'INSERT INTO "ms" ("id") VALUES ($1);',
+            default: 'INSERT INTO `ms` (`id`) VALUES ($1);'
+          },
+          bind: [0]
+        });
+    });
   });
 
   describe('dates', () => {
@@ -161,5 +181,24 @@ describe(Support.getTestDialectTeaser('SQL'), () => {
           sqlite: 'INSERT INTO `users` (`user_name`,`pass_word`) VALUES (\'testuser\',\'12345\') ON CONFLICT (`user_name`) DO UPDATE SET `user_name`=EXCLUDED.`user_name`,`pass_word`=EXCLUDED.`pass_word`,`updated_at`=EXCLUDED.`updated_at`;'
         });
     });
+
+    it('allow bulk insert primary key with 0', () => {
+      const M = Support.sequelize.define('m', {
+        id: {
+          type: DataTypes.INTEGER,
+          primaryKey: true,
+          autoIncrement: true
+        }
+      });
+
+      expectsql(sql.bulkInsertQuery(M.tableName, [{ id: 0 }, { id: null }], {}, M.fieldRawAttributesMap),
+        {
+          query: {
+            mssql: 'SET IDENTITY_INSERT [ms] ON; INSERT INTO [ms] DEFAULT VALUES;INSERT INTO [ms] ([id]) VALUES (0),(NULL);; SET IDENTITY_INSERT [ms] OFF;',
+            postgres: 'INSERT INTO "ms" ("id") VALUES (0),(DEFAULT);',
+            default: 'INSERT INTO `ms` (`id`) VALUES (0),(NULL);'
+          }
+        });
+    });
   });
 });