diff --git a/CHANGELOG.md b/CHANGELOG.md
index b74774cd1..059726392 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 - next() can be called multiple times from Plugin hooks
 - Line and circle chats with only dimensions on x, and y axes the markers were off the axis labels.
+- Crash on TreeMap only with negative values
 
 ### Added
 
diff --git a/src/chart/generator/plot.cpp b/src/chart/generator/plot.cpp
index 86219c063..c331759e1 100644
--- a/src/chart/generator/plot.cpp
+++ b/src/chart/generator/plot.cpp
@@ -159,10 +159,11 @@ void Plot::generateMarkers(const Data::DataTable &table)
 	}
 	clearEmptyBuckets(mainBuckets, true);
 	clearEmptyBuckets(subBuckets, false);
-	auto conn = linkMarkers(mainBuckets, true);
+	auto hasMarkerConnection = linkMarkers(mainBuckets, true);
 	linkMarkers(subBuckets, false);
 
-	if (conn && options->geometry.get() == ShapeType::line
+	if (hasMarkerConnection
+	    && options->geometry.get() == ShapeType::line
 	    && options->getChannels().at(ChannelId::x).isDimension()
 	    && options->getChannels().at(ChannelId::y).isDimension()) {
 		markerConnectionOrientation.emplace(
diff --git a/src/chart/speclayout/treemap.cpp b/src/chart/speclayout/treemap.cpp
index 060174761..268721372 100644
--- a/src/chart/speclayout/treemap.cpp
+++ b/src/chart/speclayout/treemap.cpp
@@ -16,11 +16,17 @@ TreeMap::TreeMap(const std::vector<double> &sizes,
 	for (auto j = 0U; j < sizes.size(); ++j)
 		markers.emplace_back(j, sizes[j]);
 
-	std::sort(markers.begin(), markers.end(), SpecMarker::sizeOrder);
+	std::ranges::sort(markers, SpecMarker::sizeOrder);
 
-	divide(markers.begin(), markers.end(), p0, p1);
+	auto it = std::ranges::upper_bound(markers,
+	    SpecMarker{0, 0.0},
+	    SpecMarker::sizeOrder);
 
-	std::sort(markers.begin(), markers.end(), SpecMarker::indexOrder);
+	divide(markers.begin(), it, p0, p1);
+
+	while (it != markers.end()) it++->emplaceRect({0, 0}, {0, 0});
+
+	std::ranges::sort(markers, SpecMarker::indexOrder);
 }
 
 void TreeMap::divide(It begin,
diff --git a/test/e2e/tests/fixes.json b/test/e2e/tests/fixes.json
index 3b65987a9..9862851cc 100644
--- a/test/e2e/tests/fixes.json
+++ b/test/e2e/tests/fixes.json
@@ -48,6 +48,9 @@
 		},
 		"53978116": {
 			"refs": ["d0d0298"]
+		},
+		"55278793": {
+			"refs": ["6825f33"]
 		}
 	}
 }
diff --git a/test/e2e/tests/fixes/55278793.mjs b/test/e2e/tests/fixes/55278793.mjs
new file mode 100644
index 000000000..9aaadce70
--- /dev/null
+++ b/test/e2e/tests/fixes/55278793.mjs
@@ -0,0 +1,22 @@
+const testSteps = [
+	(chart) =>
+		chart.animate({
+			data: {
+				series: [
+					{
+						name: 'D1',
+						values: ['v1', 'v2']
+					},
+					{
+						name: 'M1',
+						values: [-1, -2]
+					}
+				]
+			},
+			config: {
+				size: ['D1', 'M1']
+			}
+		})
+]
+
+export default testSteps
diff --git a/tools/ci/run/init-py.sh b/tools/ci/run/init-py.sh
index a431f04c4..fc6cdac3a 100755
--- a/tools/ci/run/init-py.sh
+++ b/tools/ci/run/init-py.sh
@@ -7,6 +7,8 @@ if ! python3 -c 'import sys; assert sys.version_info >= (3,10)' > /dev/null; the
     exit 1
 fi
 
+test -f ~/.netrc && chmod u+rw,u-x,go-rwx ~/.netrc
+
 python3.10 -m venv --copies ".venv" || python3 -m venv --copies ".venv"
 source .venv/bin/activate
 pip install pdm==2.10.3