From 6731e8f6312b1fcee2c2554dfef8494298963bf0 Mon Sep 17 00:00:00 2001
From: Juergen Spitzmueller <spitz@lyx.org>
Date: Tue, 23 Apr 2019 08:58:01 +0200
Subject: [PATCH] Only write btUnits if we have a bibliography

Fixes: #11562
---
 src/output_latex.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/output_latex.cpp b/src/output_latex.cpp
index c231761917..ab3760f9ed 100644
--- a/src/output_latex.cpp
+++ b/src/output_latex.cpp
@@ -12,6 +12,7 @@
 
 #include "output_latex.h"
 
+#include "BiblioInfo.h"
 #include "Buffer.h"
 #include "BufferParams.h"
 #include "Encoding.h"
@@ -1436,7 +1437,8 @@ void latexParagraphs(Buffer const & buf,
 
 	if (multibib_child && mparams.useBiblatex())
 		os << "\\newrefsection";
-	else if (multibib_child && mparams.useBibtopic()) {
+	else if (multibib_child && mparams.useBibtopic()
+		 && !buf.masterBibInfo().empty()) {
 		os << "\\begin{btUnit}\n";
 		runparams.openbtUnit = true;
 	}
@@ -1546,7 +1548,8 @@ void latexParagraphs(Buffer const & buf,
 		    && layout.latexname() == bparams.multibib) {
 			if (runparams.openbtUnit)
 				os << "\\end{btUnit}\n";
-			if (!bparams.useBiblatex()) {
+			if (!bparams.useBiblatex()
+			    && !buf.masterBibInfo().empty()) {
 				os << '\n' << "\\begin{btUnit}\n";
 				runparams.openbtUnit = true;
 			}
-- 
2.39.5