Error in composeTweet section

[imDarkceus]

after writing a caption and selecting an image when i click on Tweet button to post my tweet it shows error in console and the loading icon is continuously spinning.

The error:
E/flutter ( 4210): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Null check operator used on a null value
E/flutter ( 4210): #0 _ComposeTweetReplyPageState.createTweetModel (package:flutter_twitter_clone/ui/page/feed/composeTweet/composeTweet.dart:168:28)
E/flutter ( 4210): #1 _ComposeTweetReplyPageState._submitButton (package:flutter_twitter_clone/ui/page/feed/composeTweet/composeTweet.dart:96:34)
E/flutter ( 4210): #2 CustomAppBar._getActionButtons. (package:flutter_twitter_clone/widgets/customAppBar.dart:90:64)
E/flutter ( 4210): #3 OnPressed.ripple. (package:flutter_twitter_clone/ui/theme/extention.dart:36:30)
E/flutter ( 4210): #4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:989:21)
E/flutter ( 4210): #5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:198:24)
E/flutter ( 4210): #6 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
E/flutter ( 4210): #7 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
E/flutter ( 4210): #8 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:230:7)
E/flutter ( 4210): #9 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:563:9)
E/flutter ( 4210): #10 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:94:12)
E/flutter ( 4210): #11 PointerRouter._dispatchEventToRoutes. (package:flutter/src/gestures/pointer_router.dart:139:9)
E/flutter ( 4210): #12 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:539:8)
E/flutter ( 4210): #13 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:137:18)
E/flutter ( 4210): #14 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:123:7)
E/flutter ( 4210): #15 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:439:19)
E/flutter ( 4210): #16 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:419:22)
E/flutter ( 4210): #17 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:322:11)
E/flutter ( 4210): #18 GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
E/flutter ( 4210): #19 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
E/flutter ( 4210): #20 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
E/flutter ( 4210): #21 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
E/flutter ( 4210): #22 _rootRunUnary (dart:async/zone.dart:1444:13)
E/flutter ( 4210): #23 _CustomZone.runUnary (dart:async/zone.dart:1335:19)
E/flutter ( 4210): #24 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
E/flutter ( 4210): #25 _invoke1 (dart:ui/hooks.dart:169:10)
E/flutter ( 4210): #26 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:293:7)
E/flutter ( 4210): #27 _dispatchPointerDataPacket (dart:ui/hooks.dart:88:31)
E/flutter ( 4210):
W/ActivityThread( 4210): SCHED: com.nexa.twrt/com.thealphamerc.flutter_twitter_clone.MainActivity [80, r=10060ms, a=2396ms, w=309996ms]

[ericlchen369]

im having the same error...

below is my flutter doctor output:

[✓] Flutter (Channel unknown, 2.10.0, on macOS 12.0.1 21A559 darwin-arm, locale en-GB)
• Flutter version 2.10.0 at /Users/mreric/Documents/Projects/development/flutter
• Upstream repository unknown
• Framework revision 5f105a6ca7 (4 months ago), 2022-02-01 14:15:42 -0800
• Engine revision 776efd2034
• Dart version 2.16.0
• DevTools version 2.9.2

[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
• Android SDK at /Users/mreric/Library/Android/sdk
• Platform android-32, build-tools 32.0.0
• ANDROID_HOME = /Users/mreric/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• CocoaPods version 1.11.2

[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.2)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)

[✓] Connected device (4 available)
• sdk gphone64 arm64 (mobile) • emulator-5554 • android-arm64 • Android 12 (API 32) (emulator)
• sdk gphone64 arm64 (mobile) • emulator-5556 • android-arm64 • Android 12 (API 32) (emulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 12.0.1 21A559 darwin-arm
• Chrome (web) • chrome • web-javascript • Google Chrome 101.0.4951.64

[✓] HTTP Host Availability
• All required HTTP hosts are available

[vineetk1984]

I'm also facing exactly the same issue. Not able to post any tweet.

[TheAlphamerc]

Just checked the create tweet functionality and it is working fine. Maybe the issue you are facing is causing due to some special use cases. Or if you can share the steps to reproduce the issue will help me identify the root cause.

[diegomartins404]

I've been having this same problem. This happen when you have created an account without have the database setted up yet, so you have the account (created by firebase authentication) but you dont have the data about the user in the database (firestore database or realtime database) because the database were not accesible when you have created the account, so is impossible to load the userModel with the data from the database, because there's no data about the user in the database to load from.