diff --git a/tracker/tracker/.yarn/install-state.gz b/tracker/tracker/.yarn/install-state.gz
index 41b6c9638..7592b3842 100644
Binary files a/tracker/tracker/.yarn/install-state.gz and b/tracker/tracker/.yarn/install-state.gz differ
diff --git a/tracker/tracker/CHANGELOG.md b/tracker/tracker/CHANGELOG.md
index 8a5114ff2..e74e1fdef 100644
--- a/tracker/tracker/CHANGELOG.md
+++ b/tracker/tracker/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 15.1.1
+
+- fix for attributeSender dictionary keys
+
 ## 15.1.0
 
 - move domparser for sprites under observer code for better SSR support
diff --git a/tracker/tracker/package.json b/tracker/tracker/package.json
index 2c90d8d64..7cf58ba96 100644
--- a/tracker/tracker/package.json
+++ b/tracker/tracker/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@openreplay/tracker",
   "description": "The OpenReplay tracker main package",
-  "version": "15.1.0",
+  "version": "15.1.1",
   "keywords": [
     "logging",
     "replay"
diff --git a/tracker/tracker/src/main/modules/attributeSender.ts b/tracker/tracker/src/main/modules/attributeSender.ts
index 3f0146a89..00902a302 100644
--- a/tracker/tracker/src/main/modules/attributeSender.ts
+++ b/tracker/tracker/src/main/modules/attributeSender.ts
@@ -12,12 +12,13 @@ export class StringDictionary {
 
   getKey = (str: string): [string, boolean] => {
     let isNew = false
-    if (!this.backDict[str]) {
+    const safeKey = `__${str}`
+    if (!this.backDict[safeKey]) {
       isNew = true
-      this.backDict[str] = `${this.getPageNo() ?? 0}_${this.idx}`
+      this.backDict[safeKey] = `${this.getPageNo() ?? 0}_${this.idx}`
       this.idx += 1
     }
-    return [this.backDict[str], isNew]
+    return [this.backDict[safeKey], isNew]
   }
 }