diff --git a/packages/client/src/lib/stores/phantoms.svelte.ts b/packages/client/src/lib/stores/phantoms.svelte.ts
index a2e6ecf..e351e93 100644
--- a/packages/client/src/lib/stores/phantoms.svelte.ts
+++ b/packages/client/src/lib/stores/phantoms.svelte.ts
@@ -38,11 +38,13 @@ function makeStore() {
   }
 
   function place(sq: Square, type: PieceType) {
+    if (!gameId) return;
     state.phantoms = { ...state.phantoms, [sq]: { color: oppColor, type } };
     persist();
   }
 
   function move(from: Square, to: Square) {
+    if (!gameId || from === to) return;
     const p = state.phantoms[from];
     if (!p) return;
     const next = { ...state.phantoms };
@@ -53,6 +55,7 @@ function makeStore() {
   }
 
   function remove(sq: Square) {
+    if (!gameId) return;
     const next = { ...state.phantoms };
     delete next[sq];
     state.phantoms = next;