diff --git a/lib/src/layer/polyline_layer.dart b/lib/src/layer/polyline_layer.dart
index 8ab7ff5de..30c68bc03 100644
--- a/lib/src/layer/polyline_layer.dart
+++ b/lib/src/layer/polyline_layer.dart
@@ -174,7 +174,7 @@ class PolylinePainter extends CustomPainter {
     if (polylineOpt.isDotted) {
       var spacing = polylineOpt.strokeWidth * 1.5;
       canvas.saveLayer(rect, Paint());
-      if (borderPaint != null) {
+      if (borderPaint != null && filterPaint != null) {
         _paintDottedLine(
             canvas, polylineOpt.offsets, borderRadius, spacing, borderPaint);
         _paintDottedLine(
@@ -185,12 +185,10 @@ class PolylinePainter extends CustomPainter {
     } else {
       paint.style = PaintingStyle.stroke;
       canvas.saveLayer(rect, Paint());
-      if (borderPaint != null) {
-        if (filterPaint != null) {
-          filterPaint.style = PaintingStyle.stroke;
-          _paintLine(canvas, polylineOpt.offsets, borderPaint);
-        }
-        borderPaint?.style = PaintingStyle.stroke;
+      if (borderPaint != null && filterPaint != null) {
+        borderPaint.style = PaintingStyle.stroke;
+        _paintLine(canvas, polylineOpt.offsets, borderPaint);
+        filterPaint.style = PaintingStyle.stroke;
         _paintLine(canvas, polylineOpt.offsets, filterPaint);
       }
       _paintLine(canvas, polylineOpt.offsets, paint);