diff --git a/src/util/dicontheme.cpp b/src/util/dicontheme.cpp
index 7e96ab4..dfb13d8 100644
--- a/src/util/dicontheme.cpp
+++ b/src/util/dicontheme.cpp
@@ -186,7 +186,8 @@ QIcon DIconTheme::Cached::findQIcon(const QString &iconName, Options options, co
     }
 
     auto newIcon = new QIcon(DIconTheme::findQIcon(iconName, options));
-    data->cache.insert(cacheKey, newIcon);
+    if (!newIcon->isNull())
+        data->cache.insert(cacheKey, newIcon);
 
     if (newIcon->isNull())
         return fallback;
diff --git a/src/util/private/diconproxyengine.cpp b/src/util/private/diconproxyengine.cpp
index 707983e..058c199 100644
--- a/src/util/private/diconproxyengine.cpp
+++ b/src/util/private/diconproxyengine.cpp
@@ -86,6 +86,22 @@ static inline QIconEngine *createDBuiltinIconEngine(const QString &iconName)
     return nullptr;
 }
 
+#ifdef DTK_DISABLE_LIBXDG
+static inline QIconEngine *createQIconEngine(const QString &iconName)
+{
+    QIconEngine *engine = nullptr;
+
+    // fallback to QPlatformTheme::createIconEngine ==> QIconLoaderEngine
+    QPlatformTheme * const platformTheme = QGuiApplicationPrivate::platformTheme();
+    bool hasUserTheme = QIconLoader::instance()->hasUserTheme();
+    if (platformTheme && !hasUserTheme) {
+        engine = platformTheme->QPlatformTheme::createIconEngine(iconName);
+    }
+
+    return engine;
+}
+#endif
+
 static bool hasDciIcon(const QString &iconName, const QString &iconThemeName)
 {
     QString iconPath;
@@ -103,6 +119,11 @@ static inline bool isDciIconEngine(QIconEngine *engine)
     return dynamic_cast<DDciIconEngine *>(engine);
 }
 
+static inline bool isDBuiltinIconEngine(QIconEngine *engine)
+{
+    return dynamic_cast<DBuiltinIconEngine *>(engine);
+}
+
 DIconProxyEngine::DIconProxyEngine(const QString &iconName, DIconTheme::Options options)
     : m_iconName(iconName)
     , m_option(options)
@@ -216,6 +237,16 @@ void DIconProxyEngine::virtual_hook(int id, void *data)
     }
 }
 
+void DIconProxyEngine::createQXIconengine()
+{
+#ifdef DTK_DISABLE_LIBXDG
+    if (Q_UNLIKELY(!m_option.testFlag(DIconTheme::DontFallbackToQIconFromTheme)))
+        m_iconEngine = createQIconEngine(m_iconName);
+#else
+    m_iconEngine = createXdgProxyIconEngine(m_iconName);
+#endif
+}
+
 void DIconProxyEngine::ensureEngine()
 {
     if (m_iconName.isEmpty())
@@ -227,8 +258,12 @@ void DIconProxyEngine::ensureEngine()
 
     static QMap<QString, QSet<QString>> nonCache;
     const auto it = nonCache.find(theme);
-    if (it != nonCache.end() && it->contains(m_iconName))
-        return;
+    if (it != nonCache.end() && it->contains(m_iconName)) {
+        if (isDciIconEngine(m_iconEngine) || isDBuiltinIconEngine(m_iconEngine))
+            return;
+
+        createQXIconengine();
+    }
 
     if (m_iconEngine) {
         // dci => dci
@@ -257,21 +292,11 @@ void DIconProxyEngine::ensureEngine()
     if (!m_iconEngine && Q_UNLIKELY(!m_option.testFlag(DIconTheme::IgnoreBuiltinIcons)) ) {
         m_iconEngine = createDBuiltinIconEngine(m_iconName);
     }
-#ifdef DTK_DISABLE_LIBXDG
-    if (!m_iconEngine && Q_UNLIKELY(!m_option.testFlag(DIconTheme::DontFallbackToQIconFromTheme))) {
-        // fallback to QPlatformTheme::createIconEngine ==> QIconLoaderEngine
-        QPlatformTheme * const platformTheme = QGuiApplicationPrivate::platformTheme();
-        bool hasUserTheme = QIconLoader::instance()->hasUserTheme();
-        if (platformTheme && !hasUserTheme) {
-            m_iconEngine = platformTheme->QPlatformTheme::createIconEngine(m_iconName);
-        }
-    }
-#else
-    if (!m_iconEngine ) {
-        m_iconEngine = createXdgProxyIconEngine(m_iconName);
-    }
-#endif
-    if (!m_iconEngine ) {
+
+    if (!m_iconEngine )
+        m_iconEngine = createQXIconengine();
+
+    if (!m_iconEngine && !nonCache[theme].contains(m_iconName)) {
         qErrnoWarning("create icon [%s] engine failed.[theme:%s] nonCache[theme].size[%d]",
                       m_iconName.toUtf8().data(),
                       theme.toUtf8().data(), nonCache[theme].size());
@@ -279,6 +304,14 @@ void DIconProxyEngine::ensureEngine()
         return;
     }
 
+    if (m_iconEngine && m_iconEngine->isNull()) {
+        // QIcon::setThemeSearchPaths(QIcon::themeSearchPaths());
+        delete m_iconEngine;
+        m_iconEngine = nullptr;
+    } else if (m_iconEngine && !m_iconEngine->isNull() && nonCache[theme].contains(m_iconName)) {
+        nonCache[theme].remove(m_iconName);
+    }
+
     m_iconThemeName = theme;
 }
 
diff --git a/src/util/private/diconproxyengine_p.h b/src/util/private/diconproxyengine_p.h
index c7aafdf..7efa8bb 100644
--- a/src/util/private/diconproxyengine_p.h
+++ b/src/util/private/diconproxyengine_p.h
@@ -50,6 +50,7 @@ class Q_DECL_HIDDEN DIconProxyEngine : public QIconEngine
 
     void ensureEngine();
     DIconProxyEngine(const DIconProxyEngine &other);
+    void createQXIconengine();
     QString m_iconName;
     QString m_iconThemeName;
     QIconEngine *m_iconEngine = nullptr;