From 4404f0bab2b7faf1a9d69e70e57e2e41c4def4d7 Mon Sep 17 00:00:00 2001
From: Richard Kimberly Heck <rikiheck@lyx.org>
Date: Sun, 30 Dec 2018 14:02:34 -0500
Subject: [PATCH] Fix problem reported on the mailing list.
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Somehow this got lost. Fix found by Jürgen.
---
 src/Buffer.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 6343405b5c..e24834810b 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -2457,6 +2457,11 @@ void Buffer::checkIfBibInfoCacheIsValid() const
 		return;
 	}
 
+	// if we already know the cache is invalid, no need to check
+	// the timestamps
+	if (!d->bibinfo_cache_valid_)
+		return;
+
 	// we'll assume it's ok and change this if it's not
 	d->bibinfo_cache_valid_ = true;
 	d->cite_labels_valid_ = true;