diff --git a/Telegram/SourceFiles/statistics/view/stack_linear_chart_common.cpp b/Telegram/SourceFiles/statistics/view/stack_linear_chart_common.cpp
index b7727bd714..50b86284f1 100644
--- a/Telegram/SourceFiles/statistics/view/stack_linear_chart_common.cpp
+++ b/Telegram/SourceFiles/statistics/view/stack_linear_chart_common.cpp
@@ -83,6 +83,8 @@ PiePartData PiePartsPercentageByIndices(
 	for (const auto &line : chartData.lines) {
 		auto sum = ChartValue(0);
 		for (auto i = xIndices.min; i <= xIndices.max; i++) {
+			const auto index = int(base::SafeRound(i));
+			Assert(index >= 0 && index < line.y.size());
 			sum += line.y[i];
 		}
 		if (linesFilter) {
diff --git a/Telegram/SourceFiles/statistics/widgets/point_details_widget.cpp b/Telegram/SourceFiles/statistics/widgets/point_details_widget.cpp
index c000d919b9..b5e7daa6b2 100644
--- a/Telegram/SourceFiles/statistics/widgets/point_details_widget.cpp
+++ b/Telegram/SourceFiles/statistics/widgets/point_details_widget.cpp
@@ -303,6 +303,7 @@ void PointDetailsWidget::setXIndex(int xIndex) {
 	if (xIndex < 0) {
 		return;
 	}
+	Assert(xIndex < _chartData.x.size());
 	{
 		constexpr auto kOneDay = 3600 * 24 * 1000;
 		const auto timestamp = _chartData.x[xIndex];
@@ -328,6 +329,7 @@ void PointDetailsWidget::setXIndex(int xIndex) {
 		= (_chartData.currency == Data::StatisticalCurrency::Credits);
 	for (auto i = 0; i < _chartData.lines.size(); i++) {
 		const auto &dataLine = _chartData.lines[i];
+		Assert(xIndex < dataLine.y.size());
 		auto textLine = Line();
 		textLine.id = dataLine.id;
 		if (_maxPercentageWidth) {