From e7b98148a49dd313cf99eb349d0d382388689229 Mon Sep 17 00:00:00 2001
From: deltanedas <@deltanedas:kde.org>
Date: Sun, 9 Mar 2025 23:58:40 +0000
Subject: [PATCH] realer

---
 Content.Server/_Shitmed/Medical/Surgery/SurgerySystem.cs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Content.Server/_Shitmed/Medical/Surgery/SurgerySystem.cs b/Content.Server/_Shitmed/Medical/Surgery/SurgerySystem.cs
index da9bd0a1dd..928f062fa7 100644
--- a/Content.Server/_Shitmed/Medical/Surgery/SurgerySystem.cs
+++ b/Content.Server/_Shitmed/Medical/Surgery/SurgerySystem.cs
@@ -185,7 +185,8 @@ public sealed class SurgerySystem : SharedSurgerySystem
             }
         }
 
-        dnas.Remove(target.Comp1.DNA);
+        if (target.Comp1.DNA is {} dna)
+            dnas.Remove(dna);
 
         return total + dnas.Count * target.Comp2.CrossContaminationDirtinessLevel;
     }
@@ -210,8 +211,11 @@ public sealed class SurgerySystem : SharedSurgerySystem
         Dirty(ent, dirtiness);
     }
 
-    private void AddDNA(EntityUid ent, string dna)
+    private void AddDNA(EntityUid ent, string? dna)
     {
+        if (dna == null)
+            return;
+
         var contamination = EnsureComp<SurgeryCrossContaminationComponent>(ent);
         contamination.DNAs.Add(dna);
     }