diff --git a/src/data/pokemon-forms.ts b/src/data/pokemon-forms.ts
index 6c5c7bd0b4c..681ea127b0c 100644
--- a/src/data/pokemon-forms.ts
+++ b/src/data/pokemon-forms.ts
@@ -244,7 +244,7 @@ export class SpeciesFormChangeCompoundTrigger {
   constructor(...triggers: SpeciesFormChangeTrigger[]) {
     this.triggers = triggers;
     //
-    this.description = this.triggers.filter(trigger => trigger.description.length > 0).map(trigger => trigger.description).join(", ");
+    this.description = this.triggers.filter(trigger => trigger?.description?.length > 0).map(trigger => trigger.description).join(", ");
   }
 
   canChange(pokemon: Pokemon): boolean {