--- a/core/moduleapi.lua	Thu Jun 26 15:17:57 2025 +0100
+++ b/core/moduleapi.lua	Fri Jun 27 11:11:08 2025 +0100
@@ -405,7 +405,11 @@
 end
 
 function api:context(host)
-	return setmetatable({ host = host or "*", global = "*" == host }, { __index = self, __newindex = self });
+	local is_global = host == "*";
+	if not is_global and not hosts[host] then
+		error("Cannot create context for unknown host: "..host);
+	end
+	return setmetatable({ host = host or "*", global = is_global }, { __index = self, __newindex = self });
 end
 
 function api:add_item(key, value)