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-rw-r--r--lib/PublicInbox/WwwHighlight.pm1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/PublicInbox/WwwHighlight.pm b/lib/PublicInbox/WwwHighlight.pm
index 3d6ca03b..09fc48ab 100644
--- a/lib/PublicInbox/WwwHighlight.pm
+++ b/lib/PublicInbox/WwwHighlight.pm
@@ -52,6 +52,7 @@ sub read_in_full ($) {
                 $off += $r;
         }
         $env->{'psgi.errors'}->print("input read error: $!\n");
+        undef;
 }
 
 # entry point for PSGI