diff --git a/CHANGES.md b/CHANGES.md
index ecc231f785d..12846152e92 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -22,6 +22,7 @@
 - Fix globe materials when lighting is false. Slope/Aspect material no longer rely on turning on lighting or shadows. [#11563](https://github.com/CesiumGS/cesium/issues/11563)
 - Fixed a bug where `GregorianDate` constructor would not validate the input parameters for valid date. [#10075](https://github.com/CesiumGS/cesium/pull/10075)
 - Fixed improper scaling of ellipsoid inner radii in 3D mode. [#11656](https://github.com/CesiumGS/cesium/issues/11656) and [#10245](https://github.com/CesiumGS/cesium/issues/10245)
+- Fixed an issue where `DataSource` objects incorrectly shared a single `PolylineCollection` in the `PolylineGeometryUpdater`. Updated `PolylineGeometryUpdater` to create a distinct `PolylineCollection` instance per `DataSource`. This resolves the crashes reported under [#7758](https://github.com/CesiumGS/cesium/issues/7758) and [#9154](https://github.com/CesiumGS/cesium/issues/9154).
 
 #### @cesium/widgets
 
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 0f86551f31e..db802c9e918 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -371,6 +371,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute to Cesiu
 - [hongfaqiu](https://github.com/hongfaqiu)
 - [KOBAYASHI Ittoku](https://github.com/kittoku)
 - [王康](https://github.com/yieryi)
+- [rropp5](https://github.com/rropp5)
 - [孙永政](https://github.com/syzdev)
 - [Subhajit Saha](https://github.com/subhajits)
 - [Jared Webber](https://github.com/jaredwebber)
diff --git a/packages/engine/Source/DataSources/PolylineGeometryUpdater.js b/packages/engine/Source/DataSources/PolylineGeometryUpdater.js
index 6ad349c9d86..44798c2cc26 100644
--- a/packages/engine/Source/DataSources/PolylineGeometryUpdater.js
+++ b/packages/engine/Source/DataSources/PolylineGeometryUpdater.js
@@ -661,12 +661,13 @@ function getLine(dynamicGeometryUpdater) {
     return dynamicGeometryUpdater._line;
   }
 
-  const sceneId = dynamicGeometryUpdater._geometryUpdater._scene.id;
-  let polylineCollection = polylineCollections[sceneId];
   const primitives = dynamicGeometryUpdater._primitives;
+  const polylineCollectionId =
+    dynamicGeometryUpdater._geometryUpdater._scene.id + primitives._guid;
+  let polylineCollection = polylineCollections[polylineCollectionId];
   if (!defined(polylineCollection) || polylineCollection.isDestroyed()) {
     polylineCollection = new PolylineCollection();
-    polylineCollections[sceneId] = polylineCollection;
+    polylineCollections[polylineCollectionId] = polylineCollection;
     primitives.add(polylineCollection);
   } else if (!primitives.contains(polylineCollection)) {
     primitives.add(polylineCollection);
@@ -869,13 +870,14 @@ DynamicGeometryUpdater.prototype.isDestroyed = function () {
 
 DynamicGeometryUpdater.prototype.destroy = function () {
   const geometryUpdater = this._geometryUpdater;
-  const sceneId = geometryUpdater._scene.id;
-  const polylineCollection = polylineCollections[sceneId];
+  const polylineCollectionId =
+    geometryUpdater._scene.id + this._primitives._guid;
+  const polylineCollection = polylineCollections[polylineCollectionId];
   if (defined(polylineCollection)) {
     polylineCollection.remove(this._line);
     if (polylineCollection.length === 0) {
       this._primitives.removeAndDestroy(polylineCollection);
-      delete polylineCollections[sceneId];
+      delete polylineCollections[polylineCollectionId];
     }
   }
   if (defined(this._groundPolylinePrimitive)) {