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-rw-r--r--IkiWiki/Plugin/sparkline.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/IkiWiki/Plugin/sparkline.pm b/IkiWiki/Plugin/sparkline.pm
index c1f016ffd..fb4849492 100644
--- a/IkiWiki/Plugin/sparkline.pm
+++ b/IkiWiki/Plugin/sparkline.pm
@@ -149,7 +149,7 @@ sub preprocess (@) {
waitpid $pid, 0;
$SIG{PIPE}="DEFAULT";
- if ($sigpipe) {
+ if ($sigpipe || ! defined $png) {
error gettext("failed to run php");
}