Exception thrown when using "$ \hat f(\xi) = \int_{-\infty}^\infty f(x)e^{- 2\pi i \xi x}\mathrm{d}x $"
======== Exception caught by rendering library =====================================================
Null check operator used on a null value
The relevant error-causing widget was:
KaTeX file:///Users/xxx/katex_flutter/example/lib/main.dart:63:41
The following _CastError was thrown during paint():
Null check operator used on a null value
The relevant error-causing widget was:
KaTeX file:///Users/xxx/katex_flutter/example/lib/main.dart:63:41
When the exception was thrown, this was the stack:
#0 TextPainter.paint (package:flutter/src/painting/text_painter.dart:624:36)
#1 RenderParagraph.paint (package:flutter/src/rendering/paragraph.dart:700:18)
#2 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2311:7)
#3 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:189:13)
#4 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2616:15)
...
The following RenderObject was being processed when the exception was fired: RenderParagraph#555c8 relayoutBoundary=up4
... needs compositing
... parentData: offset=Offset(189.0, 97.0); flex=null; fit=null (can use size)
... constraints: BoxConstraints(0.0<=w<=784.0, 0.0<=h<=Infinity)
... size: Size(406.0, 16.0)
... textAlign: start
... textDirection: ltr
... softWrap: wrapping at box width
... overflow: clip
... locale: en_US
... maxLines: unlimited
RenderObject: RenderParagraph#555c8 relayoutBoundary=up4
needs compositing
parentData: offset=Offset(189.0, 97.0); flex=null; fit=null (can use size)
constraints: BoxConstraints(0.0<=w<=784.0, 0.0<=h<=Infinity)
size: Size(406.0, 16.0)
textAlign: start
textDirection: ltr
softWrap: wrapping at box width
overflow: clip
locale: en_US
maxLines: unlimited
... text: TextSpan
... debugLabel: (englishLike body1 2014).merge(blackMountainView bodyText2)
... inherit: false
... color: Color(0xdd000000)
... family: Roboto
... size: 14.0
... weight: 400
... baseline: alphabetic
... decoration: TextDecoration.none
... : TextSpan
... debugLabel: (englishLike body1 2014).merge(blackMountainView bodyText2)
... inherit: false
... color: Color(0xdd000000)
... family: Roboto
... size: 14.0
... weight: 400
... baseline: alphabetic
... decoration: TextDecoration.none
... : WidgetSpan#c8f5c
... alignment: middle
Edited by Dawei