diff --git a/D&D_5e_Reshaped/precompiled/components/sheetWorkers.js b/D&D_5e_Reshaped/precompiled/components/sheetWorkers.js
index ac413913ca..40c8717802 100644
--- a/D&D_5e_Reshaped/precompiled/components/sheetWorkers.js
+++ b/D&D_5e_Reshaped/precompiled/components/sheetWorkers.js
@@ -3911,7 +3911,7 @@ const updateNPCHP = () => {
             hpFormula += ` - ${amount}`;
           }
         }
-        v.hp_extra.replace(splitFormula[0], '');
+        v.hp_extra.toString().replace(splitFormula[0], '');
       }
     }