diff --git a/src/class_diagram/visitor/translation_unit_visitor.cc b/src/class_diagram/visitor/translation_unit_visitor.cc
index 05ec6880..8cdb608a 100644
--- a/src/class_diagram/visitor/translation_unit_visitor.cc
+++ b/src/class_diagram/visitor/translation_unit_visitor.cc
@@ -1199,6 +1199,9 @@ void translation_unit_visitor::process_function_parameter(
             relationship_t::kDependency);
 
         for (const auto &[type, relationship_type] : relationships) {
+            if (type.empty())
+                continue;
+
             auto [type_ns, type_name] = cx::util::split_ns(type);
             if (ctx.diagram().should_include(type_ns, type_name) &&
                 (relationship_type != relationship_t::kNone) &&
diff --git a/src/common/model/diagram_filter.cc b/src/common/model/diagram_filter.cc
index 4389ba1b..e37392ff 100644
--- a/src/common/model/diagram_filter.cc
+++ b/src/common/model/diagram_filter.cc
@@ -582,6 +582,9 @@ void diagram_filter::init_filters(const config::diagram &c)
 template <>
 bool diagram_filter::should_include<std::string>(const std::string &name) const
 {
+    if (name.empty())
+        return false;
+
     auto [ns, n] = cx::util::split_ns(name);
 
     return should_include(ns, n);