diff --git a/labs/crazyegg-integration/README.md b/labs/crazyegg-integration/README.md
index 1ea9d8a..9942f9c 100644
--- a/labs/crazyegg-integration/README.md
+++ b/labs/crazyegg-integration/README.md
@@ -42,7 +42,7 @@ The Crazy Egg integration allows you to see heatmaps with Optimizely data.
   ],
   "description": "This integration allows you to see heatmaps with Optimizely data.",
   "options": {
-    "track_layer_decision": "if(extension.heatmaps === \"on\") {\n  if(!isHoldback) {\n    window.CE_SNAPSHOT_NAME = '' + variationId;\n  }\n}\n"
+    "track_layer_decision": "if(extension.heatmaps === \"on\") {\n  if(!isHoldback && typeof variationId === \"string\" && variationId !== \"\") {\n    window.CE_SNAPSHOT_NAME = variationId;\n  }\n}\n"
   }
 }
 ```
diff --git a/labs/crazyegg-integration/config.json b/labs/crazyegg-integration/config.json
index 1f4376f..7d76b04 100644
--- a/labs/crazyegg-integration/config.json
+++ b/labs/crazyegg-integration/config.json
@@ -21,8 +21,8 @@
       }
     }
   ],
-  "description": "This integration allows you to see heatmaps with Optimizely data.
+  "description": "This integration allows you to see heatmaps with Optimizely data.",
   "options": {
-    "track_layer_decision": "if(extension.heatmaps === \"on\") {\n  if(!isHoldback) {\n    window.CE_SNAPSHOT_NAME = '' + variationId;\n  }\n}\n"
+    "track_layer_decision": "if(extension.heatmaps === \"on\") {\n  if(!isHoldback && typeof variationId === \"string\" && variationId !== \"\") {\n    window.CE_SNAPSHOT_NAME = variationId;\n  }\n}\n"
   }
 }