lib/PublicInbox/ViewVCS.pm | 2 +-

diff --git a/lib/PublicInbox/ViewVCS.pm b/lib/PublicInbox/ViewVCS.pm
index 021b70cf2180a935711ad5d602e2c600962f81d0..3cbc363b9d113b4b811af9d1acc121e03ad9f5cd 100644
--- a/lib/PublicInbox/ViewVCS.pm
+++ b/lib/PublicInbox/ViewVCS.pm
@@ -194,7 +194,7 @@ 		defined(my $v = $qp->{$from}) or next;
 		$hints->{$to} = $v if $v ne '';
 	}
 
-	$ctx->{'log'} = tmpfile("solve.$oid_b");
+	$ctx->{'log'} = tmpfile("solve.$oid_b") // die "tmpfile: $!";
 	$ctx->{fn} = $fn;
 	my $solver = PublicInbox::SolverGit->new($ctx->{ibx},
 						\&solve_result, $ctx);