diff --git a/lib/error_highlight/core_ext.rb b/lib/error_highlight/core_ext.rb
index d3a4dba..78cda8a 100644
--- a/lib/error_highlight/core_ext.rb
+++ b/lib/error_highlight/core_ext.rb
@@ -15,6 +15,7 @@ def to_s
       return msg unless locs
 
       loc = locs.first
+      return msg unless loc
       begin
         node = RubyVM::AbstractSyntaxTree.of(loc, keep_script_lines: true)
         opts = {}
diff --git a/test/test_error_highlight.rb b/test/test_error_highlight.rb
index 08036bc..d31e394 100644
--- a/test/test_error_highlight.rb
+++ b/test/test_error_highlight.rb
@@ -1194,4 +1194,17 @@ def test_no_final_newline
       end
     end
   end
+
+  def test_simulate_funcallv_from_embedded_ruby
+    assert_error_message(NoMethodError, <<~END) do
+undefined method `foo' for nil:NilClass
+    END
+
+      nil.foo + 1
+    rescue NoMethodError => exc
+      def exc.backtrace_locations = []
+      raise
+    end
+  end
+
 end