Fix freeze when player cannot contain mission reward

src/npctalk.cpp

@@ -1759,9 +1759,16 @@ void talk_effect_fun_t::set_u_buy_item( const itype_id &item_name, int cost, int
             item container( container_name, calendar::turn );
             container.put_in( item( item_name, calendar::turn, count ),
                               item_pocket::pocket_type::CONTAINER );
-            d.alpha->i_add( container );
-            //~ %1%s is the NPC name, %2$s is an item
-            popup( _( "%1$s gives you a %2$s." ), d.beta->disp_name(), container.tname() );
+            if( d.alpha->get_character()->can_stash( container ) ) {
+                //~ %1$s is the NPC name, %2$s is an item
+                popup( _( "%1$s gives you a %2$s." ), d.beta->disp_name(), container.tname() );
+                d.alpha->i_add( container );
+            } else {
+                //~ %1$s and %3$s are the NPC name, %2$s is an item
+                popup( _( "%1$s gives you a %2$s, but you don't have enough space to hold it!  %3$s placed it on the ground for you." ),
+                       d.beta->disp_name(), container.tname(), d.beta->disp_name() );
+                get_map().add_item( d.alpha->pos(), container );
+            }
         }
     };