{"id":146,"hash":"4e3d7bc12d4c39408fe05f976eba94a678ee0916e5f96b05f94fdf6748fcc155","pattern":"Cannot update a component while rendering a different component warning","full_message":"I am getting this warning in react:\n\nindex.js:1 Warning: Cannot update a component (`ConnectFunction`) \nwhile rendering a different component (`Register`). To locate the \nbad setState() call inside `Register` \n\nI went to the locations indicated in the stack trace and removed all setstates but the warning still persists. Is it possible this could occur from redux dispatch?\n\nmy code:\n\nregister.js\n\nclass Register extends Component {\n  render() {\n    if( this.props.registerStatus === SUCCESS) { \n      // Reset register status to allow return to register page\n      this.props.dispatch( resetRegisterStatus())  # THIS IS THE LINE THAT CAUSES THE ERROR ACCORDING TO THE STACK TRACE\n      return <Redirect push to = {HOME}/>\n    }\n    return (\n      <div style = {{paddingTop: \"180px\", background: 'radial-gradient(circle, rgba(106,103,103,1) 0%, rgba(36,36,36,1) 100%)', height: \"100vh\"}}>\n        <RegistrationForm/>\n      </div>\n    );\n  }\n}\n\nfunction mapStateToProps( state ) {\n  return {\n    registerStatus: state.userReducer.registerStatus\n  }\n}\n\nexport default connect ( mapStateToProps ) ( Register );\n\nfunction which triggers the warning in my registerForm component called by register.js\n\nhandleSubmit = async () => {\n    if( this.isValidForm() ) { \n      const details = {\n        \"username\": this.state.username,\n        \"password\": this.state.password,\n        \"email\": this.state.email,\n        \"clearance\": this.state.clearance\n      }\n      await this.props.dispatch( register(details) )\n      if( this.props.registerStatus !== SUCCESS && this.mounted ) {\n        this.setState( {errorMsg: this.props.registerError})\n        this.handleShowError()\n      }\n    }\n    else {\n      if( this.mounted ) {\n        this.setState( {errorMsg: \"Error - registration credentials are invalid!\"} )\n        this.handleShowError()\n      }\n    }\n  }\n\nStacktrace:","ecosystem":"npm","package_name":"reactjs","package_version":null,"solution":"I fixed this issue by removing the dispatch from the register components render method to the componentwillunmount method. This is because I wanted this logic to occur right before redirecting to the login page. In general it's best practice to put all your logic outside the render method so my code was just poorly written before. Hope this helps anyone else in future :)\n\nMy refactored register component:\n\nclass Register extends Component {\n\n  componentWillUnmount() {\n    // Reset register status to allow return to register page\n    if ( this.props.registerStatus !== \"\" ) this.props.dispatch( resetRegisterStatus() )\n  }\n\n  render() {\n    if( this.props.registerStatus === SUCCESS ) { \n      return <Redirect push to = {LOGIN}/>\n    }\n    return (\n      <div style = {{paddingTop: \"180px\", background: 'radial-gradient(circle, rgba(106,103,103,1) 0%, rgba(36,36,36,1) 100%)', height: \"100vh\"}}>\n        <RegistrationForm/>\n      </div>\n    );\n  }\n}","confidence":0.95,"source":"stackoverflow","source_url":"https://stackoverflow.com/questions/62336340/cannot-update-a-component-while-rendering-a-different-component-warning","votes":421,"created_at":"2026-04-19T04:41:23.148070+00:00","updated_at":"2026-04-19T04:51:05.202868+00:00"}