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Fix NPE in frontend

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This commit is contained in:
Arne Keller 2021-08-29 15:59:42 +02:00
parent 29d692c231
commit 540f95c0f8
1 changed files with 5 additions and 1 deletions
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6
frontend/src/mathjax-proof-tree.ts
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@ -374,7 +374,8 @@ class MathjaxProofTree extends MathjaxAdapter {
const handleMouseEvent = (e: MouseEvent, mouseIn: boolean) => {
let typeTarget = e.target! as SVGGraphicsElement;
let counter = 0;
while (!typeTarget.classList.contains("typicalc-type")
while (typeTarget.classList
&& !typeTarget.classList.contains("typicalc-type")
&& !typeTarget.classList.contains("typicalc-label")) {
typeTarget = typeTarget.parentNode! as SVGGraphicsElement;
counter++;
@ -382,6 +383,9 @@ class MathjaxProofTree extends MathjaxAdapter {
return;
}
}
if (!typeTarget.classList) {
return;
}
let isType = typeTarget.classList.contains("typicalc-type");
let isLabel = typeTarget.classList.contains("typicalc-label");
if (mouseIn) {