오류

강의 듣다가 아래와 같은 오류가 발생하고 에뮬레이터 상에서 사진처럼 저런 에러가 발생했습니다

저 부분 말고 나머지 기능은 전부 다 실행이 되는데 어떻게 해결해야 될까요..

구글링을 해봐도 해결방법을 모르겠어서 남깁니다 ㅠ

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════

The following assertion was thrown building:

'package:flutter/src/painting/_network_image_io.dart': Failed assertion: line 26 pos 14: 'url !=

null': is not true.

Either the assertion indicates an error in the framework itself, or we should provide substantially

more information in this error message to help you determine and fix the underlying cause.

In either case, please report this assertion by filing a bug on GitHub:

  https://github.com/flutter/flutter/issues/new?template=BUG.md

When the exception was thrown, this was the stack:

#2      new NetworkImage (package:flutter/src/painting/_network_image_io.dart:26:14)

#3      new Image.network (package:flutter/src/widgets/image.dart:404:68)

#4      _SearchPageState._buildListItem (package:instagram_clone/search_page.dart:65:24)

#5      _SearchPageState._buildBody.<anonymous closure>.<anonymous closure> (package:instagram_clone/search_page.dart:48:20)

#6      SliverChildBuilderDelegate.build (package:flutter/src/widgets/sliver.dart:448:22)

#7      SliverMultiBoxAdaptorElement._build.<anonymous closure> (package:flutter/src/widgets/sliver.dart:1136:67)

#8      _HashMap.putIfAbsent (dart:collection-patch/collection_patch.dart:140:29)

#9      SliverMultiBoxAdaptorElement._build (package:flutter/src/widgets/sliver.dart:1136:26)

#10     SliverMultiBoxAdaptorElement.createChild.<anonymous closure> (package:flutter/src/widgets/sliver.dart:1149:55)

#11     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2620:19)

#12     SliverMultiBoxAdaptorElement.createChild (package:flutter/src/widgets/sliver.dart:1142:11)

#13     RenderSliverMultiBoxAdaptor._createOrObtainChild.<anonymous closure> (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:356:23)

#14     RenderObject.invokeLayoutCallback.<anonymous closure> (package:flutter/src/rendering/object.dart:1868:58)

#15     PipelineOwner._enableMutationsToDirtySubtrees (package:flutter/src/rendering/object.dart:920:15)

#16     RenderObject.invokeLayoutCallback (package:flutter/src/rendering/object.dart:1868:13)

#17     RenderSliverMultiBoxAdaptor._createOrObtainChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:345:5)

#18     RenderSliverMultiBoxAdaptor.insertAndLayoutChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:491:5)

#19     RenderSliverGrid.performLayout (package:flutter/src/rendering/sliver_grid.dart:590:17)

#20     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#21     RenderSliverEdgeInsetsPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:137:11)

#22     RenderSliverPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:377:11)

#23     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#24     RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:471:13)

#25     RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1465:12)

#26     RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1374:20)

#27     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#28     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#29     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#30     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#31     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#32     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#33     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#34     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#35     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#36     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#37     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#38     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#39     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#40     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#41     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#42     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#43     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#44     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#45     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#46     MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:173:11)

#47     _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:495:7)

#48     MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:242:7)

#49     RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:401:14)

#50     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#51     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#52     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#53     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:13)

#54     _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1269:11)

#55     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#56     RenderPositionedBox.performLayout (package:flutter/src/rendering/shifted_box.dart:396:13)

#57     RenderObject.layout (package:flutter/src/rendering/object.dart:1769:7)

#58     MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:173:11)

#59     _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:495:7)

#60     MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:242:7)

#61     RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:401:14)

#62     RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1632:7)

#63     PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:889:18)

#64     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:404:19)

#65     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:867:13)

#66     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:286:5)

#67     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1117:15)

#68     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1056:9)

#69     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:972:5)

#73     _invoke (dart:ui/hooks.dart:253:10)

#74     _drawFrame (dart:ui/hooks.dart:211:3)

(elided 5 frames from class _AssertionError and dart:async)

════════════════════════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by widgets library ═══════════════════════════════════════════════════════

The following assertion was thrown building:

'package:flutter/src/painting/_network_image_io.dart': Failed assertion: line 26 pos 14: 'url != null': is not true.

Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.

In either case, please report this assertion by filing a bug on GitHub:

  https://github.com/flutter/flutter/issues/new?template=BUG.md

When the exception was thrown, this was the stack: 

#2      new NetworkImage (package:flutter/src/painting/_network_image_io.dart:26:14)

#3      new Image.network (package:flutter/src/widgets/image.dart:404:68)

#4      _SearchPageState._buildListItem (package:instagram_clone/search_page.dart:65:24)

#5      _SearchPageState._buildBody.<anonymous closure>.<anonymous closure> (package:instagram_clone/search_page.dart:48:20)

#6      SliverChildBuilderDelegate.build (package:flutter/src/widgets/sliver.dart:448:22)

...

════════════════════════════════════════════════════════════════════════════════════════════════════