[v11.0.x] datatrails: quick bugfix: handle undefined step (#87338)

datatrails: quick bugfix: handle undefined step (#87337)

fix: handle undefined step
(cherry picked from commit 6524febbd4)

Co-authored-by: Darren Janeczek <38694490+darrenjaneczek@users.noreply.github.com>

public/app/features/trails/DataTrail.tsx

@@ -94,8 +94,10 @@ export class DataTrail extends SceneObjectBase<DataTrailState> {
     }
 
     // Disconnects the current step history state from the current state, to prevent changes affecting history state
-    const currentState = this.state.history.state.steps[this.state.history.state.currentStep].trailState;
-    this.restoreFromHistoryStep(currentState);
+    const currentState = this.state.history.state.steps[this.state.history.state.currentStep]?.trailState;
+    if (currentState) {
+      this.restoreFromHistoryStep(currentState);
+    }
 
     this.enableUrlSync();