---
params:
featuredImage: featured.png # forgot to indent
---
€ hugo build -D
Start building sites …
hugo v0.161.1+extended+withdeploy linux/amd64 BuildDate=unknown VendorInfo=nixpkgs
Total in 33 ms
ERROR error building site: assemble: failed to create page from pageMetaSource /news: "[redacted]/website/content/news/_index.md:1:1": unable to cast <nil> of type <nil> to map[string]interface {}
€ hugo server -D
# ...
# 1.
Built in 105 ms
Environment: "development"
Serving pages from disk
Running in Fast Render Mode. For full rebuilds on change: hugo server --disableFastRender
Web Server is available at http://localhost:1313/ (bind address 127.0.0.1)
Press Ctrl+C to stop
# 3.
Change detected, rebuilding site (#1).
2026-05-14 01:20:35.566 +0200
Source changed /news/_index.md
ERROR Rebuild failed: assemble: failed to create page from pageMetaSource /news: "[redacted]/content/news/_index.md:1:1": unable to cast <nil> of type <nil> to map[string]interface {}
Web Server is available at http://localhost:1313/ (bind address 127.0.0.1)
Total in 1 ms
# 5.
Change detected, rebuilding site (#2).
2026-05-14 01:20:38.066 +0200
Source changed /news/_index.md
Web Server is available at http://localhost:1313/ (bind address 127.0.0.1)
Total in 0 ms
panic: interface conversion: *hugolib.pageMetaSource is not hugolib.contentNodeLookupContentNode: missing method lookupContentNode
goroutine 68 [running]:
github.com/gohugoio/hugo/hugolib.contentNodes.lookupContentNode(...)
github.com/gohugoio/hugo/hugolib/content_map_page_contentnode.go:198
github.com/gohugoio/hugo/hugolib.(*contentNodeShifter).Shift(0xcb3487721e0?, {0x3466e58, 0xcb349a00888}, {0x1, 0x0, 0x0}, 0x0)
github.com/gohugoio/hugo/hugolib/content_map_page_contentnodeshifter.go:158 +0xd3
github.com/gohugoio/hugo/hugolib/doctree.(*NodeShiftTree[...]).shift(...)
github.com/gohugoio/hugo/hugolib/doctree/nodeshifttree.go:653
github.com/gohugoio/hugo/hugolib/doctree.(*NodeShiftTreeWalker[...]).toT(0x1000000010000?, 0xcb3483bede0?, {0x3466e58?, 0xcb349a00888?})
github.com/gohugoio/hugo/hugolib/doctree/nodeshifttree.go:640 +0x68
github.com/gohugoio/hugo/hugolib.(*HugoSites).withPage.(*HugoSites).withPage.(*HugoSites).allSites.func3.(*HugoSites).withPage-range1.(*NodeShiftTreeWalker[...]).Walk.func5.1({0x3466e58, 0xcb349a00888})
github.com/gohugoio/hugo/hugolib/doctree/nodeshifttree.go:551 +0x125
github.com/gohugoio/hugo/hugolib/doctree.(*walkHandler[...]).Handle(0x163c965?, {0xcb3483bede0?, 0xcb348ea4e70?}, {0x3466e58?, 0xcb349a00888?})
github.com/gohugoio/hugo/hugolib/doctree/nodeshifttree.go:501 +0x38
github.com/gohugoio/go-radix.recursiveWalk[...](0xcb3493a89c0, {0x3466db8, 0xcb34974e2c0})
github.com/gohugoio/[email protected]/radix.go:604 +0x89
github.com/gohugoio/go-radix.recursiveWalk[...](0xcb3493a8990, {0x3466db8, 0xcb34974e2c0})
github.com/gohugoio/[email protected]/radix.go:622 +0x15c
github.com/gohugoio/go-radix.recursiveWalk[...](0xcb3486c6c30, {0x3466db8, 0xcb34974e2c0})
github.com/gohugoio/[email protected]/radix.go:622 +0x15c
github.com/gohugoio/go-radix.(*Tree[...]).Walk(0x7d148288b528?, {0x3466db8?, 0xcb34974e2c0?})
github.com/gohugoio/[email protected]/radix.go:504 +0x27
github.com/gohugoio/hugo/hugolib.(*HugoSites).withPage.(*HugoSites).withPage.(*HugoSites).allSites.func3.(*HugoSites).withPage-range1.(*NodeShiftTreeWalker[...]).Walk.func5({0x347d960, 0x581ca20}, 0xcb3489e5bc0, 0x34b3300)
github.com/gohugoio/hugo/hugolib/doctree/nodeshifttree.go:621 +0x225
github.com/gohugoio/hugo/hugolib/doctree.(*NodeShiftTreeWalker[...]).Walk(...)
github.com/gohugoio/hugo/hugolib/doctree/nodeshifttree.go:632
github.com/gohugoio/hugo/hugolib.(*HugoSites).withPage-range1(...)
github.com/gohugoio/hugo/hugolib/hugo_sites.go:602
github.com/gohugoio/hugo/hugolib.(*HugoSites).withPage.(*HugoSites).allSites.func3(...)
github.com/gohugoio/hugo/hugolib/hugo_sites.go:174
github.com/gohugoio/hugo/hugolib.(*HugoSites).withPage(0x3476ca0?, 0xcb3489e5b90)
github.com/gohugoio/hugo/hugolib/hugo_sites.go:591 +0x192
github.com/gohugoio/hugo/hugolib.(*HugoSites).resolveAndResetDependententPageOutputs(0xcb348c01688, {0x347d960, 0x581ca20}, {0xcb34952b340, 0x1, 0x1})
github.com/gohugoio/hugo/hugolib/content_map_page.go:1143 +0x2ca
github.com/gohugoio/hugo/hugolib.(*HugoSites).resolveAndClearStateForIdentities.func5()
github.com/gohugoio/hugo/hugolib/content_map_page.go:1051 +0x136
github.com/gohugoio/hugo/common/loggers.TimeTrackfn(0xcb3482be7d8)
github.com/gohugoio/hugo/common/loggers/logger.go:394 +0x35
github.com/gohugoio/hugo/hugolib.(*HugoSites).resolveAndClearStateForIdentities(0xcb348c01688, {0x347d960, 0x581ca20}, {0x3495370, 0xcb3491b5680}, 0x0, {0xcb34952b340, 0x1, 0x1})
github.com/gohugoio/hugo/hugolib/content_map_page.go:1046 +0x772
github.com/gohugoio/hugo/hugolib.(*HugoSites).processPartialFileEvents(0xcb348c01688, {0x347d960, 0x581ca20}, {0x3495370, 0xcb3491b5680}, 0xcb349584100, 0xcb3482bf558, {0xcb349610140, 0x2, 0x2})
github.com/gohugoio/hugo/hugolib/hugo_sites_build.go:1190 +0x201c
github.com/gohugoio/hugo/hugolib.(*HugoSites).process(0xcb348c01688, {0x347d960, 0x581ca20}, {0x3495370?, 0xcb3491b5680?}, 0xcb349584100, 0xcb3482bf558, {0xcb349610140, 0x2, 0x2})
github.com/gohugoio/hugo/hugolib/hugo_sites_build.go:288 +0x265
github.com/gohugoio/hugo/hugolib.(*HugoSites).Build.func6(...)
github.com/gohugoio/hugo/hugolib/hugo_sites_build.go:170
github.com/gohugoio/hugo/hugolib.(*HugoSites).Build(0xcb348c01688, {0x0, 0x0, 0x0, 0x0, 0xcb34888ed80, 0x0, 0x1, 0x0}, {0xcb349610140, ...})
github.com/gohugoio/hugo/hugolib/hugo_sites_build.go:186 +0x831
github.com/gohugoio/hugo/commands.(*hugoBuilder).rebuildSites(0xcb348e45280, {0xcb349610140, 0x1, 0x2})
github.com/gohugoio/hugo/commands/hugobuilder.go:1146 +0x1ed
github.com/gohugoio/hugo/commands.(*hugoBuilder).handleEvents.func7(0xcb348e45280, 0xcb349594060)
github.com/gohugoio/hugo/commands/hugobuilder.go:949 +0x79
github.com/gohugoio/hugo/commands.(*hugoBuilder).handleEvents(0xcb348e45280, 0xcb349363590, 0xcb3492b6890, {0xcb348b6a3c0, 0x5, 0x8}, 0xcb349371c80)
github.com/gohugoio/hugo/commands/hugobuilder.go:952 +0x1b85
github.com/gohugoio/hugo/commands.(*hugoBuilder).newWatcher.func2()
github.com/gohugoio/hugo/commands/hugobuilder.go:393 +0x2aa
created by github.com/gohugoio/hugo/commands.(*hugoBuilder).newWatcher in goroutine 1
github.com/gohugoio/hugo/commands/hugobuilder.go:364 +0x4d4
If the frontmatter contains an unrecognized key ,
hugo buildfails with a rather unhelpful error message:When running
hugo serverand fixing the error, the server panics:To reproduce:
featuredImage.hugo serverfeaturedImage, and savehugo serveragain works as expectedWhat version of Hugo are you using (
hugo version)?Does this issue reproduce with the latest release?
Yes