From 4f2263a963910ad8039f0f4da8afa7db4614f590 Mon Sep 17 00:00:00 2001
From: Filip Sykala - NTB T15p <Filip.Sykala@prusa3d.cz>
Date: Tue, 8 Nov 2022 08:53:38 +0100
Subject: [PATCH] Fix generation of preview bitmap for bad font.

---
 src/slic3r/GUI/Jobs/CreateFontNameImageJob.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/slic3r/GUI/Jobs/CreateFontNameImageJob.cpp b/src/slic3r/GUI/Jobs/CreateFontNameImageJob.cpp
index a16a0c5d44..87cab96f95 100644
--- a/src/slic3r/GUI/Jobs/CreateFontNameImageJob.cpp
+++ b/src/slic3r/GUI/Jobs/CreateFontNameImageJob.cpp
@@ -112,6 +112,10 @@ void CreateFontImageJob::finalize(bool canceled, std::exception_ptr &)
     
     *m_input.is_created = true;
 
+    // Exist result bitmap with preview?
+    // (not valid input. e.g. not loadable font)
+    if (m_result.empty()) return;
+
     // upload texture on GPU
     const GLenum target = GL_TEXTURE_2D;
     glsafe(::glBindTexture(target, m_input.texture_id));