From 9d0316d7f11e176190ee4523ecd222f1cd01c4ce Mon Sep 17 00:00:00 2001
From: jpirnay <jens@pirnay.com>
Date: Sun, 29 Mar 2026 09:23:56 +0200
Subject: [PATCH] Review comment

---
 lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp b/lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp
index 4e097e1d..27d6badc 100644
--- a/lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp
+++ b/lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp
@@ -191,9 +191,15 @@ void XMLCALL ChapterHtmlSlimParser::startElement(void* userData, const XML_Char*
       cacheKey += '|';
       cacheKey += classAttr;
       auto it = self->cssStyleCache_.find(cacheKey);
-      if (it == self->cssStyleCache_.end())
-        it = self->cssStyleCache_.emplace(cacheKey, self->cssParser->resolveStyle(name, classAttr)).first;
-      cssStyle = it->second;
+      if (it != self->cssStyleCache_.end()) {
+        cssStyle = it->second;
+      } else {
+        CssStyle resolved = self->cssParser->resolveStyle(name, classAttr);
+        if (resolved.defined.anySet())
+          cssStyle = self->cssStyleCache_.emplace(cacheKey, resolved).first->second;
+        else
+          cssStyle = resolved;  // transient fallback: skip cache so future calls can re-resolve
+      }
     }
     if (!styleAttr.empty()) {
       auto it = self->inlineStyleCache_.find(styleAttr);