From af7ebbfab6e221e0594e61c5c91e8e4d1107ed2b Mon Sep 17 00:00:00 2001
From: PavelMikus <pavel.mikus.mail@seznam.cz>
Date: Wed, 24 Aug 2022 12:38:04 +0200
Subject: [PATCH] make sure inner loop has length > 0 during shifting

---
 src/libslic3r/GCode/SeamPlacer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libslic3r/GCode/SeamPlacer.cpp b/src/libslic3r/GCode/SeamPlacer.cpp
index 8cfdde4328..032f852dd2 100644
--- a/src/libslic3r/GCode/SeamPlacer.cpp
+++ b/src/libslic3r/GCode/SeamPlacer.cpp
@@ -1637,7 +1637,7 @@ void SeamPlacer::place_seam(const Layer *layer, ExtrusionLoop &loop, bool extern
         seam_point = projected_point.foot_pt;
 
         //lastly, for internal perimeters, do the shifting if needed
-        if (po->config().shifted_inner_seams) {
+        if (po->config().shifted_inner_seams && loop.length() > 0.0) {
             //fix depth, it is sometimes strongly underestimated
             depth = std::max(loop.paths[projected_point.path_idx].width, depth);