diff --git a/src/protocols/ForeignToplevelWlr.cpp b/src/protocols/ForeignToplevelWlr.cpp
index 06814c88..6bbd377c 100644
--- a/src/protocols/ForeignToplevelWlr.cpp
+++ b/src/protocols/ForeignToplevelWlr.cpp
@@ -347,7 +347,7 @@ CForeignToplevelWlrProtocol::CForeignToplevelWlrProtocol(const wl_interface* ifa
     static auto P3 = g_pHookSystem->hookDynamic("activeWindow", [this](void* self, SCallbackInfo& info, std::any data) {
         const auto PWINDOW = std::any_cast<PHLWINDOW>(data);
 
-        if (!windowValidForForeign(PWINDOW))
+        if (PWINDOW && !windowValidForForeign(PWINDOW))
             return;
 
         for (auto const& m : m_vManagers) {