diff --git a/src/components/video-editor/timeline/core/spans.test.ts b/src/components/video-editor/timeline/core/spans.test.ts
index 9bc0ebf0..29b02545 100644
--- a/src/components/video-editor/timeline/core/spans.test.ts
+++ b/src/components/video-editor/timeline/core/spans.test.ts
@@ -20,7 +20,7 @@ describe("timeline core/spans", () => {
 	it("clamps start when requested end exceeds total", () => {
 		expect(
 			normalizeRegionSpan({ startMs: 980, endMs: 1200, totalMs: 1000, minDurationMs: 100 }),
-		).toEqual({ start: 900, end: 1080 });
+		).toEqual({ start: 900, end: 1000 });
 	});
 
 	it("keeps already valid spans unchanged", () => {
@@ -28,4 +28,10 @@ describe("timeline core/spans", () => {
 			normalizeRegionSpan({ startMs: 100, endMs: 300, totalMs: 1000, minDurationMs: 50 }),
 		).toEqual({ start: 100, end: 300 });
 	});
+
+	it("never exceeds total when min duration is larger than total", () => {
+		expect(
+			normalizeRegionSpan({ startMs: 100, endMs: 300, totalMs: 80, minDurationMs: 100 }),
+		).toEqual({ start: 0, end: 80 });
+	});
 });
diff --git a/src/components/video-editor/timeline/core/spans.ts b/src/components/video-editor/timeline/core/spans.ts
index 8f49973e..6f8ac203 100644
--- a/src/components/video-editor/timeline/core/spans.ts
+++ b/src/components/video-editor/timeline/core/spans.ts
@@ -11,11 +11,14 @@ export function normalizeRegionSpan(params: {
 	minDurationMs: number;
 }) {
 	const { startMs, endMs, totalMs, minDurationMs } = params;
-	const clampedStart = Math.max(0, Math.min(startMs, totalMs));
-	const minEnd = clampedStart + minDurationMs;
-	const clampedEnd = Math.min(totalMs, Math.max(minEnd, endMs));
-	const normalizedStart = Math.max(0, Math.min(clampedStart, totalMs - minDurationMs));
-	const normalizedEnd = Math.max(minEnd, Math.min(clampedEnd, totalMs));
+	const safeTotalMs = Math.max(0, totalMs);
+	const safeMinDurationMs = Math.max(0, Math.min(minDurationMs, safeTotalMs));
+	const clampedStart = Math.max(0, Math.min(startMs, safeTotalMs));
+	const normalizedStart = Math.max(0, Math.min(clampedStart, safeTotalMs - safeMinDurationMs));
+	const normalizedEnd = Math.min(
+		safeTotalMs,
+		Math.max(endMs, normalizedStart + safeMinDurationMs),
+	);
 
 	return { start: normalizedStart, end: normalizedEnd };
 }