fix(virtual-core): fix Error: Unexpected undefined in scrollToIndex (#1004)

Author: RobinMalfait

.changeset/chatty-ravens-stay.md

@@ -0,0 +1,5 @@
+---
+'@tanstack/virtual-core': patch
+---
+
+fix(virtual-core): fix `Error: Unexpected undefined`

packages/virtual-core/src/index.ts

@@ -998,9 +998,10 @@ export class Virtualizer<
         )
 
         if (elementInDOM) {
-          const [latestOffset] = notUndefined(
-            this.getOffsetForIndex(index, align),
-          )
+          const result = this.getOffsetForIndex(index, align)
+          if (!result) return
+          const [latestOffset] = result
+
           const currentScrollOffset = this.getScrollOffset()
           if (!approxEqual(latestOffset, currentScrollOffset)) {
             this.scrollToIndex(index, { align, behavior })