fix reconcile null guard

Author: ryansolid

.changeset/fresh-apricots-remain.md

@@ -0,0 +1,5 @@
+---
+"solid-js": patch
+---
+
+fix reconcile null guard

packages/solid/store/src/modifiers.ts

@@ -54,7 +54,7 @@ function applyState(
         end >= start &&
         newEnd >= start &&
         (previous[end] === target[newEnd] ||
-          (key && previous[start] && target[start] && previous[end][key] === target[newEnd][key]));
+          (key && previous[end] && target[newEnd] && previous[end][key] === target[newEnd][key]));
         end--, newEnd--
       ) {
         temp[newEnd] = previous[end];