diff --git a/app/controllers/api/v1/grid_weapons_controller.rb b/app/controllers/api/v1/grid_weapons_controller.rb
index 2dbe5d6..f68e011 100644
--- a/app/controllers/api/v1/grid_weapons_controller.rb
+++ b/app/controllers/api/v1/grid_weapons_controller.rb
@@ -60,8 +60,8 @@ module Api
 
         @weapon.ax_modifier1 = nil if weapon_params[:ax_modifier1] == -1
         @weapon.ax_modifier2 = nil if weapon_params[:ax_modifier2] == -1
-        @weapon.ax_strength1 = nil if weapon_params[:ax_strength1].zero?
-        @weapon.ax_strength2 = nil if weapon_params[:ax_strength2].zero?
+        @weapon.ax_strength1 = nil if weapon_params[:ax_strength1]&.zero?
+        @weapon.ax_strength2 = nil if weapon_params[:ax_strength2]&.zero?
 
         render json: GridWeaponBlueprint.render(@weapon, view: :nested) if @weapon.save
       end