diff --git a/src/__tests__/utils.js b/src/__tests__/utils.js
index 007d8deac..57afc1d8b 100644
--- a/src/__tests__/utils.js
+++ b/src/__tests__/utils.js
@@ -231,6 +231,24 @@ describe('loadScript', () => {
                 expect(_isBlockedUA(randomisedUserAgent, ['testington'])).toBe(true)
             }
         )
+
+        it('should block googlebot desktop', () => {
+            expect(
+                _isBlockedUA(
+                    'Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/W.X.Y.Z Safari/537.36',
+                    []
+                )
+            ).toBe(true)
+        })
+
+        it('should block openai bot', () => {
+            expect(
+                _isBlockedUA(
+                    'Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GPTBot/1.0; +https://openai.com/gptbot)',
+                    []
+                )
+            ).toBe(true)
+        })
     })
 
     describe('_isUrlMatchingRegex', () => {
diff --git a/src/utils.ts b/src/utils.ts
index 8884e0eee..e9524cf74 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -501,12 +501,17 @@ export const DEFAULT_BLOCKED_UA_STRS = [
 // This is to block various web spiders from executing our JS and
 // sending false capturing data
 export const _isBlockedUA = function (ua: string, customBlockedUserAgents: string[]): boolean {
-    return DEFAULT_BLOCKED_UA_STRS.concat(customBlockedUserAgents).some((blockedUA) => {
-        if (ua.includes) {
-            return ua.includes(blockedUA)
+    if (!ua) {
+        return false
+    }
+    const uaLower = ua.toLowerCase()
+    return DEFAULT_BLOCKED_UA_STRS.concat(customBlockedUserAgents || []).some((blockedUA) => {
+        const blockedUaLower = blockedUA.toLowerCase()
+        if (uaLower.includes) {
+            return uaLower.includes(blockedUaLower)
         } else {
             // IE 11 :/
-            return ua.indexOf(blockedUA) !== -1
+            return uaLower.indexOf(blockedUaLower) !== -1
         }
     })
 }