diff --git a/lib/config/activationcontext.hpp b/lib/config/activationcontext.hpp
index e22f6b290..a2f9f9e1c 100644
--- a/lib/config/activationcontext.hpp
+++ b/lib/config/activationcontext.hpp
@@ -19,6 +19,12 @@ public:
 
 	static ActivationContext::Ptr GetCurrentContext();
 
+	static inline
+	void AssertOnContext()
+	{
+		GetCurrentContext();
+	}
+
 private:
 	static void PushContext(const ActivationContext::Ptr& context);
 	static void PopContext();
diff --git a/lib/config/applyrule.cpp b/lib/config/applyrule.cpp
index fec461845..9df377d32 100644
--- a/lib/config/applyrule.cpp
+++ b/lib/config/applyrule.cpp
@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: 2012 Icinga GmbH <https://icinga.com>
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include "config/activationcontext.hpp"
 #include "config/applyrule.hpp"
 #include "base/logger.hpp"
 #include <set>
@@ -62,6 +63,8 @@ void ApplyRule::AddRule(const String& sourceType, const String& targetType, cons
 	const Expression::Ptr& expression, const Expression::Ptr& filter, const String& package, const String& fkvar,
 	const String& fvvar, const Expression::Ptr& fterm, bool ignoreOnError, const DebugInfo& di, const Dictionary::Ptr& scope)
 {
+	ActivationContext::AssertOnContext();
+
 	auto actualTargetType (&targetType);
 
 	if (*actualTargetType == "") {