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fix(runtime-vapor): prevent v-for crash on looping through null or undefined array#14328

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edison1105 merged 3 commits intovuejs:minorfrom
steel97:fix/vfor-null
Jan 19, 2026
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fix(runtime-vapor): prevent v-for crash on looping through null or undefined array#14328
edison1105 merged 3 commits intovuejs:minorfrom
steel97:fix/vfor-null

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@steel97
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@steel97 steel97 commented Jan 16, 2026 •
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When porting my project to vapor, I noticed component crash. After digging into it I find out that v-for crashes with undefined/null input which was not the case for vdom. This PR aims to fix that issue.

repl (not working):
vapor

repl (working):
vdom

repl (working):
vapor this PR

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Size Report

Bundles

File Size Gzip Brotli
compiler-dom.global.prod.js 85.5 kB 30 kB 26.4 kB
runtime-dom.global.prod.js 108 kB 40.7 kB 36.6 kB
vue.global.prod.js 167 kB 60.8 kB 54.2 kB

Usages

Name Size Gzip Brotli
createApp (CAPI only) 48.3 kB 18.9 kB 17.3 kB
createApp 57.3 kB 22 kB 20.1 kB
createApp + vaporInteropPlugin 78.5 kB 29 kB 26.4 kB
createVaporApp 27.9 kB 10.7 kB 9.83 kB
createSSRApp 61.6 kB 23.9 kB 21.7 kB
defineCustomElement 63.3 kB 23.9 kB 21.8 kB
overall 72.1 kB 27.3 kB 24.9 kB

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commit: 0ebb40a

@edison1105 edison1105 added version: minor scope: vapor related to vapor mode labels Jan 19, 2026
@edison1105 edison1105 merged commit e77b6e1 into vuejs:minor Jan 19, 2026
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@steel97 @edison1105