diff --git a/.eslintrc.js b/.eslintrc.js
index 1aba513..9b9f349 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -24,6 +24,7 @@ module.exports = {
     jest: true,
   },
   rules: {
+    '@typescript-eslint/no-unsafe-return': 'warn',
     '@typescript-eslint/no-unsafe-call': 'warn',
     '@typescript-eslint/no-unsafe-argument': 'warn',
     '@typescript-eslint/no-unsafe-assignment': 'warn',
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 75f9e58..906dd20 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,7 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - logic backend components
 - forms now have multiple notification
 - layout for forms
-- mariadb / mysql support
+- mariadb / mysql support (fixes https://github.com/ohmyform/ohmyform/issues/143)
 - user confirmation tokens
 - email verification
 
diff --git a/src/app.imports.ts b/src/app.imports.ts
index e127cc7..133c767 100644
--- a/src/app.imports.ts
+++ b/src/app.imports.ts
@@ -64,7 +64,7 @@ export const imports = [
   JwtModule.registerAsync({
     imports: [ConfigModule],
     inject: [ConfigService],
-    useFactory: async (configService: ConfigService): Promise<JwtModuleOptions> => ({
+    useFactory: (configService: ConfigService): JwtModuleOptions => ({
       secret: configService.get<string>('SECRET_KEY'),
       signOptions: {
         expiresIn: '4h',
@@ -154,7 +154,7 @@ export const imports = [
   MailerModule.forRootAsync({
     imports: [ConfigModule],
     inject: [ConfigService],
-    useFactory: async (configService: ConfigService) => ({
+    useFactory: (configService: ConfigService) => ({
       transport: configService.get<string>('MAILER_URI', 'smtp://localhost:1025'),
       defaults: {
         from: configService.get<string>('MAILER_FROM', 'OhMyForm <no-reply@localhost>'),
diff --git a/src/cli.ts b/src/cli.ts
index 3bd068b..9a9e261 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -5,7 +5,7 @@ const bootstrap = new BootstrapConsole({
   module: AppModule,
   useDecorators: true,
 });
-bootstrap.init().then(async (app) => {
+void bootstrap.init().then(async (app) => {
   try {
     await app.init();
     await bootstrap.boot();
diff --git a/src/command/user.command.ts b/src/command/user.command.ts
index 861714a..ad2c373 100644
--- a/src/command/user.command.ts
+++ b/src/command/user.command.ts
@@ -59,7 +59,7 @@ export class UserCommand {
   @Command({
     command: 'activate <username>',
   })
-  async activate(username: string): Promise<void> {
+  activate(username: string): void {
     console.log(`activate user ${username}`)
   }
 }
diff --git a/src/config/fields.ts b/src/config/fields.ts
index 0169fb7..2d18f50 100644
--- a/src/config/fields.ts
+++ b/src/config/fields.ts
@@ -17,7 +17,8 @@ export const fieldTypes = [
 
 export const matchType = {
   color: /^#([A-F0-9]{6}|[A-F0-9]{3})$/i,
-  url: /((([A-Z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?)/i,
+  // eslint-disable-next-line max-len
+  url: /((([A-Z]{3,9}:(?:\/\/)?)(?:[-;:&=+$,\w]+@)?[A-Z0-9.-]+|(?:www.|[-;:&=+$,\w]+@)[A-Z0-9.-]+)((?:\/[+~%/.\w-_]*)?\??(?:[-+=&;%@.\w_]*)#?(?:[\w]*))?)/i,
   email: /.+@.+\..+/,
   slug: /^[a-z0-9_]+$/,
 }
diff --git a/src/dto/form/form.field.model.ts b/src/dto/form/form.field.model.ts
index 5b1012b..59c0fea 100644
--- a/src/dto/form/form.field.model.ts
+++ b/src/dto/form/form.field.model.ts
@@ -44,8 +44,8 @@ export class FormFieldModel {
     this.description = document.description
     this.required = document.required
     this.value = document.value
-    this.options = document.options ? document.options.map(option => new FormFieldOptionModel(option)) : []
-    this.logic = document.logic ? document.logic.map(logic => new FormFieldLogicModel(logic)) : []
+    this.options = document.options?.map(option => new FormFieldOptionModel(option)) || []
+    this.logic = document.logic?.map(logic => new FormFieldLogicModel(logic)) || []
     this.rating = document.rating ? new FormFieldRatingModel(document.rating) : null
   }
 }
diff --git a/src/main.ts b/src/main.ts
index 0f88766..45d6aea 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -4,7 +4,7 @@ import cors from 'cors'
 import { Logger } from 'nestjs-pino'
 import { AppModule } from './app.module'
 
-(async () => {
+void (async () => {
   const options: NestApplicationOptions =  {
     bufferLogs: true,
   }
diff --git a/src/resolver/auth/auth.register.resolver.ts b/src/resolver/auth/auth.register.resolver.ts
index 23e74cc..2abdbd5 100644
--- a/src/resolver/auth/auth.register.resolver.ts
+++ b/src/resolver/auth/auth.register.resolver.ts
@@ -22,7 +22,7 @@ export class AuthRegisterResolver {
   async authRegister(
     @Args({ name: 'user' }) data: UserCreateInput,
   ): Promise<AuthJwtModel> {
-    if (await this.settingService.isTrue('SIGNUP_DISABLED')) {
+    if (this.settingService.isTrue('SIGNUP_DISABLED')) {
       throw new Error('signup disabled')
     }
 
diff --git a/src/resolver/form/form.statistic.resolver.ts b/src/resolver/form/form.statistic.resolver.ts
index a70f8fc..2cbc102 100644
--- a/src/resolver/form/form.statistic.resolver.ts
+++ b/src/resolver/form/form.statistic.resolver.ts
@@ -12,7 +12,7 @@ export class FormStatisticResolver {
   }
 
   @Query(() => FormStatisticModel)
-  async getFormStatistic(): Promise<FormStatisticModel> {
+  getFormStatistic(): FormStatisticModel {
     return new FormStatisticModel()
   }
 
diff --git a/src/resolver/setting/setting.resolver.ts b/src/resolver/setting/setting.resolver.ts
index 3554881..7abf806 100644
--- a/src/resolver/setting/setting.resolver.ts
+++ b/src/resolver/setting/setting.resolver.ts
@@ -16,7 +16,7 @@ export class SettingResolver {
 
   @Query(() => SettingPagerModel)
   @Roles('superuser')
-  async getSettings(): Promise<SettingPagerModel> {
+  getSettings(): SettingPagerModel {
     // TODO https://github.com/ohmyform/api/issues/3
     return new SettingPagerModel(
       [],
diff --git a/src/resolver/status.resolver.ts b/src/resolver/status.resolver.ts
index 5cbafce..3c332cb 100644
--- a/src/resolver/status.resolver.ts
+++ b/src/resolver/status.resolver.ts
@@ -4,7 +4,7 @@ import { StatusModel } from '../dto/status.model'
 @Resolver(() => StatusModel)
 export class StatusResolver {
   @Query(() => StatusModel)
-  async status(): Promise<StatusModel> {
+  status(): StatusModel {
     return new StatusModel({
       version: process.env.version || 'dev',
     })
diff --git a/src/resolver/submission/submission.field.resolver.ts b/src/resolver/submission/submission.field.resolver.ts
index a52bc0f..dbaa15f 100644
--- a/src/resolver/submission/submission.field.resolver.ts
+++ b/src/resolver/submission/submission.field.resolver.ts
@@ -18,9 +18,16 @@ export class SubmissionFieldResolver {
     @Parent() parent: SubmissionFieldModel,
     @Context('cache') cache: ContextCache,
   ): Promise<FormFieldModel> {
-    const submissionField = await cache.get<SubmissionFieldEntity>(cache.getCacheKey(SubmissionFieldEntity.name, parent.id))
+    const submissionField = await cache.get<SubmissionFieldEntity>(
+      cache.getCacheKey(SubmissionFieldEntity.name, parent.id)
+    )
 
-    const field = await cache.get<FormFieldEntity>(cache.getCacheKey(FormFieldEntity.name, submissionField.fieldId), () => this.formFieldService.findById(submissionField.fieldId, submissionField.field))
+    const field = await cache.get<FormFieldEntity>(
+      cache.getCacheKey(
+        FormFieldEntity.name,
+        submissionField.fieldId),
+      () => this.formFieldService.findById(submissionField.fieldId, submissionField.field)
+    )
 
     if (!field) {
       return null
diff --git a/src/resolver/submission/submission.resolver.ts b/src/resolver/submission/submission.resolver.ts
index a0766e7..f4bc0d9 100644
--- a/src/resolver/submission/submission.resolver.ts
+++ b/src/resolver/submission/submission.resolver.ts
@@ -15,7 +15,9 @@ export class SubmissionResolver {
     @Parent() parent: SubmissionModel,
     @Context('cache') cache: ContextCache,
   ): Promise<SubmissionFieldModel[]> {
-    const submission = await cache.get<SubmissionEntity>(cache.getCacheKey(SubmissionEntity.name, parent.id))
+    const submission = await cache.get<SubmissionEntity>(
+      cache.getCacheKey(SubmissionEntity.name, parent.id)
+    )
 
     return submission.fields.map(field => {
       cache.add(cache.getCacheKey(SubmissionFieldEntity.name, field.id), field)
diff --git a/src/resolver/submission/submission.search.resolver.ts b/src/resolver/submission/submission.search.resolver.ts
index 393cdde..50ec908 100644
--- a/src/resolver/submission/submission.search.resolver.ts
+++ b/src/resolver/submission/submission.search.resolver.ts
@@ -34,7 +34,9 @@ export class SubmissionSearchResolver {
       {},
     )
 
-    submissions.forEach(submission => cache.add(cache.getCacheKey(SubmissionEntity.name, submission.id), submission))
+    submissions.forEach(submission => {
+      cache.add(cache.getCacheKey(SubmissionEntity.name, submission.id), submission)
+    })
 
     return new SubmissionPagerModel(
       submissions.map(submission => new SubmissionModel(submission)),
diff --git a/src/resolver/submission/submission.statistic.resolver.ts b/src/resolver/submission/submission.statistic.resolver.ts
index 8e0a886..7349d26 100644
--- a/src/resolver/submission/submission.statistic.resolver.ts
+++ b/src/resolver/submission/submission.statistic.resolver.ts
@@ -13,7 +13,7 @@ export class SubmissionStatisticResolver {
 
 
   @Query(() => SubmissionStatisticModel)
-  async getSubmissionStatistic(): Promise<SubmissionStatisticModel> {
+  getSubmissionStatistic(): SubmissionStatisticModel {
     return new SubmissionStatisticModel()
   }
 
diff --git a/src/resolver/user/user.resolver.ts b/src/resolver/user/user.resolver.ts
index b488af2..ba4d2aa 100644
--- a/src/resolver/user/user.resolver.ts
+++ b/src/resolver/user/user.resolver.ts
@@ -16,7 +16,7 @@ export class UserResolver {
   @Query(() => UserModel)
   @Roles('admin')
   public async getUserById(
-    @Args('id', {type: () => ID}) id,
+    @Args('id', {type: () => ID}) id: string,
     @Context('cache') cache: ContextCache,
   ): Promise<UserModel> {
     const user = await this.userService.findById(id)
@@ -33,18 +33,18 @@ export class UserResolver {
     @Parent() parent: UserModel,
     @Context('cache') cache: ContextCache,
   ): Promise<string[]> {
-    return await this.returnFieldForSuperuser(
+    return this.returnFieldForSuperuser(
       await cache.get<UserEntity>(cache.getCacheKey(UserEntity.name, parent.id)),
       user,
       c => c.roles
     )
   }
 
-  async returnFieldForSuperuser<T>(
+  returnFieldForSuperuser<T>(
     parent: UserEntity,
     user: UserEntity,
     callback: (user: UserEntity) => T
-  ): Promise<T> {
+  ): T {
     if (user.id !== parent.id && !this.userService.isSuperuser(user)) {
       throw new Error('No access to roles')
     }
diff --git a/src/resolver/user/user.statistic.resolver.ts b/src/resolver/user/user.statistic.resolver.ts
index de0e4a3..fc56186 100644
--- a/src/resolver/user/user.statistic.resolver.ts
+++ b/src/resolver/user/user.statistic.resolver.ts
@@ -1,5 +1,4 @@
-import { Query, ResolveField, Resolver } from '@nestjs/graphql'
-import { GraphQLInt } from 'graphql'
+import { Int, Query, ResolveField, Resolver } from '@nestjs/graphql'
 import { Roles } from '../../decorator/roles.decorator'
 import { UserStatisticModel } from '../../dto/user/user.statistic.model'
 import { UserStatisticService } from '../../service/user/user.statistic.service'
@@ -12,11 +11,11 @@ export class UserStatisticResolver {
   }
 
   @Query(() => UserStatisticModel)
-  async getUserStatistic(): Promise<UserStatisticModel> {
+  getUserStatistic(): UserStatisticModel {
     return new UserStatisticModel()
   }
 
-  @ResolveField('total', () => GraphQLInt)
+  @ResolveField('total', () => Int)
   @Roles('admin')
   getTotal(): Promise<number> {
     return this.statisticService.getTotal()
diff --git a/src/service/auth/auth.service.ts b/src/service/auth/auth.service.ts
index 3dce7bc..138e0e0 100644
--- a/src/service/auth/auth.service.ts
+++ b/src/service/auth/auth.service.ts
@@ -1,6 +1,7 @@
 import { Injectable } from '@nestjs/common'
 import { JwtService } from '@nestjs/jwt'
 import { PinoLogger } from 'nestjs-pino'
+import { serializeError } from 'serialize-error'
 import { AuthJwtModel } from '../../dto/auth/auth.jwt.model'
 import { UserEntity } from '../../entity/user.entity'
 import { UserService } from '../user/user.service'
@@ -26,7 +27,10 @@ export class AuthService {
         return user;
       }
     } catch (e) {
-      this.logger.error(`failed to verify user? ${e.message}`)
+      this.logger.error({
+        error: serializeError(e),
+        username,
+      },'failed to verify user')
     }
 
     return null;