From f8d9dd3452af836e6c69fc61a3c003e1f2b82a3a Mon Sep 17 00:00:00 2001
From: Simon Knott <info@simonknott.de>
Date: Wed, 4 Sep 2024 09:28:18 +0200
Subject: [PATCH] avoid NPE

---
 packages/trace-viewer/src/snapshotRenderer.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/trace-viewer/src/snapshotRenderer.ts b/packages/trace-viewer/src/snapshotRenderer.ts
index 529becc95b..10cdb38552 100644
--- a/packages/trace-viewer/src/snapshotRenderer.ts
+++ b/packages/trace-viewer/src/snapshotRenderer.ts
@@ -41,7 +41,7 @@ function cacheAndReturn(key: SnapshotRenderer, compute: () => string): string {
 
   const result = compute();
 
-  while (cacheSize + result.length > CACHE_SIZE) {
+  while (cache.size && cacheSize + result.length > CACHE_SIZE) {
     const first = cache.keys().next().value;
     cacheSize -= cache.get(first)!.length;
     cache.delete(first);