diff --git a/lib/solargraph/rspec/spec_walker/rspec_context_namespace.rb b/lib/solargraph/rspec/spec_walker/rspec_context_namespace.rb
index 3fc7579..0f6fd52 100644
--- a/lib/solargraph/rspec/spec_walker/rspec_context_namespace.rb
+++ b/lib/solargraph/rspec/spec_walker/rspec_context_namespace.rb
@@ -11,6 +11,8 @@ def from_block_ast(block_ast)
             return unless block_ast.is_a?(::Parser::AST::Node)
 
             ast = NodeTypes.context_description_node(block_ast)
+            return unless ast
+
             if ast.type == :str
               string_to_const_name(ast)
             elsif NodeTypes.a_constant?(ast)