From e7ee5516a2e05b9a1c6a7aaae5dc4eeca4ce4e45 Mon Sep 17 00:00:00 2001
From: supermerill <merill@free.fr>
Date: Sun, 6 Sep 2020 23:45:27 +0200
Subject: [PATCH] #222 crash fix when thumbnails define with no values.

---
 src/libslic3r/PrintConfig.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 7099c9aeb..8d0333a6e 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -4488,6 +4488,9 @@ void PrintConfigDef::handle_legacy(t_config_option_key &opt_key, std::string &va
         float v = boost::lexical_cast<float>(value);
         if (v > 0)
             value = boost::lexical_cast<std::string>(-v);
+    } else if (opt_key == "thumbnails") {
+        if (value.empty())
+            value = "0x0,0x0";
     } else if (opt_key == "z_steps_per_mm") {
         opt_key = "z_step";
         float v = boost::lexical_cast<float>(value);