From 9161b74d99d2bcebd0e6bcd8f1cfaa9b975782c3 Mon Sep 17 00:00:00 2001
From: Eric Fischer <enf@pobox.com>
Date: Wed, 24 Aug 2016 12:34:28 -0700
Subject: [PATCH] Don't try to revive a placeholder for a degenerate polygon
 with negative area

---
 CHANGELOG.md | 4 ++++
 tile.cpp     | 6 +++++-
 version.hpp  | 2 +-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6dc679..d6d9327 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.12.11
+
+* Don't try to revive a placeholder for a degenerate polygon that had negative area
+
 ## 1.12.10
 
 * Pass feature IDs through in tile-join
diff --git a/tile.cpp b/tile.cpp
index 3293da8..8c43a17 100644
--- a/tile.cpp
+++ b/tile.cpp
@@ -498,7 +498,11 @@ void *partial_feature_worker(void *v) {
 				}
 
 				if (geoms[g].size() < 3) {
-					geoms[g] = revive_polygon(before, area / geoms.size(), z, line_detail);
+					if (area > 0) {
+						geoms[g] = revive_polygon(before, area / geoms.size(), z, line_detail);
+					} else {
+						geoms[g].clear();
+					}
 				}
 			}
 		}
diff --git a/version.hpp b/version.hpp
index 2118583..1377088 100644
--- a/version.hpp
+++ b/version.hpp
@@ -1 +1 @@
-#define VERSION "tippecanoe v1.12.10\n"
+#define VERSION "tippecanoe v1.12.11\n"