diff --git a/packages/core/lib/dnd/PointerSensor.ts b/packages/core/lib/dnd/PointerSensor.ts
index 52c438bdfb..91f2992180 100644
--- a/packages/core/lib/dnd/PointerSensor.ts
+++ b/packages/core/lib/dnd/PointerSensor.ts
@@ -272,6 +272,10 @@ export class PointerSensor extends Sensor<
   }
 
   private handlePointerUp(event: PointerEvent) {
+    if (!this.source) {
+      return;
+    }
+
     // Prevent the default behaviour of the event
     event.preventDefault();
     event.stopPropagation();