diff --git a/tracker/tracker/src/webworker/StringDictionary.ts b/tracker/tracker/src/webworker/StringDictionary.ts
index 1d968af4a..b183ce862 100644
--- a/tracker/tracker/src/webworker/StringDictionary.ts
+++ b/tracker/tracker/src/webworker/StringDictionary.ts
@@ -1,5 +1,5 @@
 export default class StringDictionary {
-  private idx = 0
+  private idx = 1
   private backDict: Record<string, number> = {}
 
   getKey(str: string): [number, boolean] {