diff --git a/src/index.ts b/src/index.ts
index db5d820..072e09b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -173,7 +173,7 @@ cli
         process.exit(1);
       }
 
-      const technicalTerms = (options.technicalTerms || '')
+      const technicalTerms = String(options.technicalTerms ?? '')
         .split(',')
         .map((t) => t.trim())
         .filter(Boolean);