diff --git a/themes/hugo-sustain/layouts/partials/blog/headerimage.html b/themes/hugo-sustain/layouts/partials/blog/headerimage.html
index 45f44a2..92ffeca 100644
--- a/themes/hugo-sustain/layouts/partials/blog/headerimage.html
+++ b/themes/hugo-sustain/layouts/partials/blog/headerimage.html
@@ -12,8 +12,12 @@
       {{- end }}
     {{- end }}
     {{- $processes := .processes | default (slice "fill 1000x440 webp" )}}
-    {{- $image = partial "image-processing" (dict "image" $image "processes" $processes "filter" .filter) -}}
+    {{- $filter := .filter }}
+    {{- if not $image }}
+      {{- warnf "Header image '%s' not found for page %s" .src $page.RelPermalink }}
+    {{- end }}
     {{- with $image }}
+      {{- $image = partial "image-processing" (dict "image" $image "processes" $processes "filter" $filter) -}}
       <img src="{{ .RelPermalink }}" />
     {{- end }}
     {{- with .text }}<p>{{ . | markdownify }}</p>{{ end }}