diff --git a/src/core/web_contents_adapter.cpp b/src/core/web_contents_adapter.cpp
index 3533c0743c8bf29963ce9581223540db630e2b79..4129e8c335f3cb7fd195076d5b41f5b6fdda35f4 100644
--- a/src/core/web_contents_adapter.cpp
+++ b/src/core/web_contents_adapter.cpp
@@ -612,6 +612,8 @@ void WebContentsAdapter::serializeNavigationHistory(QDataStream &output)
 void WebContentsAdapter::setZoomFactor(qreal factor)
 {
     Q_D(WebContentsAdapter);
+    if (factor < content::kMinimumZoomFactor || factor > content::kMaximumZoomFactor)
+        return;
     content::HostZoomMap::SetZoomLevel(d->webContents.get(), content::ZoomFactorToZoomLevel(static_cast<double>(factor)));
 }