1 files changed, 4 insertions, 2 deletions
diff --git a/src/plugins/platforms/windows/qwindowsscreen.cpp b/src/plugins/platforms/windows/qwindowsscreen.cpp
index 34e9e8fe31..a15a39c2a4 100644
--- a/src/plugins/platforms/windows/qwindowsscreen.cpp
+++ b/src/plugins/platforms/windows/qwindowsscreen.cpp
@@ -569,8 +569,10 @@ bool QWindowsScreenManager::handleScreenChanges()
                 removeScreen(i);
         }     // for existing screens
     }     // not lock screen
-    if (primaryScreenChanged)
-        QWindowsTheme::instance()->refreshFonts();
+    if (primaryScreenChanged) {
+        if (auto theme = QWindowsTheme::instance()) // QTBUG-85734/Wine
+            theme->refreshFonts();
+    }
     QHighDpiScaling::updateHighDpiScaling();
     return true;
 }