lib/PublicInbox/ViewVCS.pm | 4 ++++

diff --git a/lib/PublicInbox/ViewVCS.pm b/lib/PublicInbox/ViewVCS.pm
index f5374517a7f12fcdf440fd3487bdc35f9e264416..ae721034b8bf07532ffc89095852eb30916afaba 100644
--- a/lib/PublicInbox/ViewVCS.pm
+++ b/lib/PublicInbox/ViewVCS.pm
@@ -62,6 +62,10 @@ 			if ($n >= $BIN_DETECT || $n == $size) {
 				my $ct = 'text/plain; charset=UTF-8';
 				return [200, ['Content-Type', $ct, @cl] ];
 			}
+			if ($r == 0) {
+				warn "premature EOF on $oid $$logref\n";
+				return html_page($ctx, 500, $logref);
+			}
 			undef; # bref keeps growing
 		}
 	});