Unscrew snail serum (#54978)

Author: Venera3

data/json/items/comestibles/mutagen.json

@@ -250,7 +250,7 @@
     "description": "A super-concentrated mutagen with the consistency of snot.  You need a syringe to inject it… if you really want to?",
     "color": "light_gray",
     "use_action": { "type": "mutagen_iv", "mutation_category": "GASTROPOD" },
-    "vitamins": [ [ "mutagen_gastropod", 500 ] ]
+    "vitamins": [ [ "mutagen_snail", 500 ] ]
   },
   {
     "id": "iv_mutagen_batrachian",
@@ -289,8 +289,7 @@
     "name": { "str": "mouse serum" },
     "description": "A super-concentrated mutagen resembling liquefied metal.  You need a syringe to inject it… if you really want to?",
     "color": "light_gray",
-    "use_action": { "type": "mutagen_iv", "mutation_category": "MOUSE" },
-    "vitamins": [ [ "mutagen_mouse", 500 ] ]
+    "use_action": { "type": "mutagen_iv", "mutation_category": "MOUSE" }
   },
   {
     "id": "mutagen",

src/iuse.cpp

@@ -1208,7 +1208,9 @@ cata::optional<int> iuse::purifier( Character *p, item *it, bool, const tripoint
     }
 
     do_purify( *p );
-    p->vitamins_mod( it->get_comestible()->default_nutrition.vitamins );
+    if( it->is_comestible() && !it->get_comestible()->default_nutrition.vitamins.empty() ) {
+        p->vitamins_mod( it->get_comestible()->default_nutrition.vitamins );
+    }
     return it->type->charges_to_use();
 }
 
@@ -1251,7 +1253,10 @@ cata::optional<int> iuse::purify_iv( Character *p, item *it, bool, const tripoin
         p->mod_thirst( 2 * num_cured );
         p->mod_fatigue( 2 * num_cured );
     }
-    p->vitamins_mod( it->get_comestible()->default_nutrition.vitamins );
+
+    if( it->is_comestible() && !it->get_comestible()->default_nutrition.vitamins.empty() ) {
+        p->vitamins_mod( it->get_comestible()->default_nutrition.vitamins );
+    }
     return it->type->charges_to_use();
 }
 

src/iuse_actor.cpp

@@ -4333,7 +4333,9 @@ cata::optional<int> mutagen_actor::use( Character &p, item &it, bool, const trip
     p.mod_stored_nutr( m_category.mutagen_hunger * mut_count );
     p.mod_thirst( m_category.mutagen_thirst * mut_count );
     p.mod_fatigue( m_category.mutagen_fatigue * mut_count );
-    p.vitamins_mod( it.get_comestible()->default_nutrition.vitamins );
+    if( it.is_comestible() && !it.get_comestible()->default_nutrition.vitamins.empty() ) {
+        p.vitamins_mod( it.get_comestible()->default_nutrition.vitamins );
+    }
 
     return it.type->charges_to_use();
 }
@@ -4392,7 +4394,9 @@ cata::optional<int> mutagen_iv_actor::use( Character &p, item &it, bool, const t
     p.mod_hunger( m_category.iv_hunger * mut_count );
     p.mod_thirst( m_category.iv_thirst * mut_count );
     p.mod_fatigue( m_category.iv_fatigue * mut_count );
-    p.vitamins_mod( it.get_comestible()->default_nutrition.vitamins );
+    if( it.is_comestible() && !it.get_comestible()->default_nutrition.vitamins.empty() ) {
+        p.vitamins_mod( it.get_comestible()->default_nutrition.vitamins );
+    }
 
     if( m_category.id == mutation_category_CHIMERA ) {
         p.add_morale( MORALE_MUTAGEN_CHIMERA, m_category.iv_morale, m_category.iv_morale_max );