Fixed error spam when displaying a child's work tab entry without biotech installed

1.4/Source/Harmony/BiotechPatches.cs

@@ -6,6 +6,7 @@ using System.Reflection.Emit;
 using HarmonyLib;
 using Verse;
 using RimWorld;
+using UnityEngine;
 
 // Non-pregnancy Biotech-related patches
 namespace rjw
@@ -20,7 +21,8 @@ namespace rjw
             yield return AccessTools.Method(typeof(LifeStageWorker_HumanlikeAdult), lifeStageStarted);
         }
 
-        // Fixes an error caused by trying to spawn a biotech-only effector when a child starts a new lifestage
+        // Fixes errors caused by trying to spawn a biotech-only effector when a child starts a new lifestage
+        // and by trying to send a biotech-only letter when a child turns three
         [HarmonyTranspiler]
         static IEnumerable<CodeInstruction> FixLifeStageStartError(IEnumerable<CodeInstruction> instructions, MethodBase original)
         {
@@ -48,4 +50,20 @@ namespace rjw
             }
         }
     }
+
+    [HarmonyPatch(typeof(WidgetsWork), "get_WorkBoxBGTex_AgeDisabled")]
+    class WidgetsWork_WorkBoxBGTex_AgeDisabled
+    {
+        [HarmonyPrefix]
+        static bool DontLoadMissingTexture(ref Texture2D __result)
+        {
+            if (!ModsConfig.BiotechActive)
+            {
+                __result = WidgetsWork.WorkBoxBGTex_Awful;
+                return false;
+            }
+
+            return true;
+        }
+    }
 }
\ No newline at end of file