diff --git a/src/components/effects/FlowScrollGrid.tsx b/src/components/effects/FlowScrollGrid.tsx
index 1292ec3..806fca9 100644
--- a/src/components/effects/FlowScrollGrid.tsx
+++ b/src/components/effects/FlowScrollGrid.tsx
@@ -4,6 +4,8 @@
 import { motion, type MotionValue, useScroll, useTransform } from "motion/react";
 import { type ReactNode, type RefObject, useLayoutEffect, useRef, useState } from "react";
 
+import { toKeyframeOffsets } from "./keyframeOffsets";
+
 const GAP_PX = 16;
 
 function FlowScrollCell({
@@ -33,14 +35,14 @@ function FlowScrollCell({
   const exitAnimation = nextRow / totalRows + scrollRangePerRow * 2;
 
   const offsetToAdd = (scrollRangePerRow / totalItems) * (currentRow + 2);
-  const range = [
+  const range = toKeyframeOffsets([
     0,
     entryAnimation - offsetToAdd,
     currPosition - offsetToAdd,
     currPosition - offsetToAdd,
     exitAnimation - offsetToAdd,
     1,
-  ];
+  ]);
 
   const scale = useTransform(scrollYProgress, range, [0.5, 0.5, 1, 1, 0.5, 0.5]);
   const isLeft = index % ITEMS_PER_ROW === 0;
diff --git a/src/components/effects/keyframeOffsets.test.ts b/src/components/effects/keyframeOffsets.test.ts
new file mode 100644
index 0000000..a0a2af5
--- /dev/null
+++ b/src/components/effects/keyframeOffsets.test.ts
@@ -0,0 +1,14 @@
+import { describe, expect, it } from "vitest";
+
+import { toKeyframeOffsets } from "./keyframeOffsets";
+
+describe("toKeyframeOffsets", () => {
+  it("clamps into [0, 1] and never decreases", () => {
+    expect(toKeyframeOffsets([0, -0.6, -0.1, -0.1, 0.9, 1])).toEqual([0, 0, 0, 0, 0.9, 1]);
+    expect(toKeyframeOffsets([0, 0.2, 0.5, 0.5, 1.4, 1])).toEqual([0, 0.2, 0.5, 0.5, 1, 1]);
+  });
+
+  it("leaves a valid range untouched", () => {
+    expect(toKeyframeOffsets([0, 0.1, 0.3, 0.3, 0.7, 1])).toEqual([0, 0.1, 0.3, 0.3, 0.7, 1]);
+  });
+});
diff --git a/src/components/effects/keyframeOffsets.ts b/src/components/effects/keyframeOffsets.ts
new file mode 100644
index 0000000..e326d4d
--- /dev/null
+++ b/src/components/effects/keyframeOffsets.ts
@@ -0,0 +1,16 @@
+// Copyright (c) 2026 Ethan Morisset
+// SPDX-License-Identifier: BUSL-1.1
+
+/**
+ * Clamp a scroll range into [0, 1] and make it non-decreasing. On WebKit with
+ * ScrollTimeline support, motion hands useTransform's input range to WAAPI as
+ * keyframe offsets, which throw a TypeError when out of range or unsorted —
+ * and that error unmounts the whole app.
+ */
+export function toKeyframeOffsets(range: number[]): number[] {
+  let floor = 0;
+  return range.map((v) => {
+    floor = Math.max(floor, Math.min(1, v));
+    return floor;
+  });
+}