Problem in flutter url display

## 🐛 Bug Report

Here's a sample of the code I've used to display images via a mapping unfortunately up till last week it was working correctly but now it does not wish to display anything and I'm getting this error when running in exception mode.

#339 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1113:5)
binding.dart:1113
#340 _invoke (dart:ui/hooks.dart:312:13)
hooks.dart:312
#341 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:383:5)
platform_dispatcher.dart:383
#342 _drawFrame (dart:ui/hooks.dart:283:31)
hooks.dart:283

Image provider: NetworkImage("", scale: 1.0)
Image key: NetworkImage("", scale: 1.0)
════════════════════════════════════════════════════════════════════════════════
D/EGL_emulation( 3360): app_time_stats: avg=1648.49ms min=169.14ms max=3127.83ms count=2
D/EGL_emulation( 3360): app_time_stats: avg=3247.52ms min=3247.52ms max=3247.52ms count=1

### Expected behavior
It should display the data from firebase accordingly and not searching for a null value from database.
### Reproduction steps
Created from a youtube video
### Configuration

**Version:** 1.x

**Platform:**
- [ ] :android: android
- [ ] :robot: Android