diff --git a/lib/lrama/state/reduce.rb b/lib/lrama/state/reduce.rb
index 45d509f7..a2b7c26c 100644
--- a/lib/lrama/state/reduce.rb
+++ b/lib/lrama/state/reduce.rb
@@ -27,6 +27,7 @@ def add_not_selected_symbol(sym)
 
       def selected_look_ahead
         if @look_ahead
+          # @type ivar @look_ahead: Array<Grammar::Symbol>
           @look_ahead - @not_selected_symbols
         else
           []
diff --git a/lib/lrama/state/resolved_conflict.rb b/lib/lrama/state/resolved_conflict.rb
index 6b67f36b..3bb3d144 100644
--- a/lib/lrama/state/resolved_conflict.rb
+++ b/lib/lrama/state/resolved_conflict.rb
@@ -8,7 +8,7 @@ class State
     class ResolvedConflict < Struct.new(:symbol, :reduce, :which, :same_prec, keyword_init: true)
       def report_message
         s = symbol.display_name
-        r = reduce.rule.precedence_sym.display_name
+        r = reduce.rule.precedence_sym&.display_name
         case
         when which == :shift && same_prec
           msg = "resolved as #{which} (%right #{s})"