diff --git a/Analysis/src/TypeFunction.cpp b/Analysis/src/TypeFunction.cpp
index 205d0fc4..9ae57fd1 100644
--- a/Analysis/src/TypeFunction.cpp
+++ b/Analysis/src/TypeFunction.cpp
@@ -2206,6 +2206,12 @@ TypeFunctionReductionResult<TypeId> indexFunctionImpl(
         return {std::nullopt, true, {}, {}};
 
     TypeId indexerTy = follow(typeParams.at(1));
+
+    if (isPending(indexerTy, ctx->solver))
+    {
+        return {std::nullopt, false, {indexerTy}, {}};
+    }
+
     std::shared_ptr<const NormalizedType> indexerNormTy = ctx->normalizer->normalize(indexerTy);
 
     // if the indexer failed to normalize, we can't reduce, but know nothing about inhabitance.
diff --git a/tests/TypeFunction.test.cpp b/tests/TypeFunction.test.cpp
index 1f8d7d66..2b7b40a3 100644
--- a/tests/TypeFunction.test.cpp
+++ b/tests/TypeFunction.test.cpp
@@ -927,6 +927,32 @@ TEST_CASE_FIXTURE(BuiltinsFixture, "index_type_function_works")
     CHECK_EQ("string", toString(tpm->givenTp));
 }
 
+TEST_CASE_FIXTURE(BuiltinsFixture, "index_wait_for_pending_no_crash")
+{
+    if (!FFlag::LuauSolverV2)
+        return;
+
+    CheckResult result = check(R"(
+        local PlayerData = {
+            Coins = 0,
+            Level = 1,
+            Exp = 0,
+            MaxExp = 100
+        }
+
+        type Keys = index<typeof(PlayerData), keyof<typeof(PlayerData)>>
+
+        -- This function makes it think that there's going to be a pending expansion
+        local function UpdateData(key: Keys, value)
+            PlayerData[key] = value
+        end
+
+        UpdateData("Coins", 2)
+    )");
+
+    // Should not crash!
+}
+
 TEST_CASE_FIXTURE(BuiltinsFixture, "index_type_function_works_w_array")
 {
     if (!FFlag::LuauSolverV2)