diff --git a/src/lib/isJWT.js b/src/lib/isJWT.js
index 1d0ade5ee..45f134770 100644
--- a/src/lib/isJWT.js
+++ b/src/lib/isJWT.js
@@ -11,5 +11,9 @@ export default function isJWT(str) {
     return false;
   }
 
+  if (dotSplit[0] === '' || dotSplit[1] === '') {
+    return false;
+  }
+
   return dotSplit.reduce((acc, currElem) => acc && isBase64(currElem, { urlSafe: true }), true);
 }
diff --git a/test/validators.test.js b/test/validators.test.js
index 98d2a12ff..3e682d22b 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -5555,6 +5555,9 @@ describe('Validators', () => {
         'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NSIsIm5hbWUiOiJKb2huIERvZSIsImlhdCI6MTYxNjY1Mzg3Mn0.eyJpc3MiOiJodHRwczovL2V4YW1wbGUuY29tIiwiaWF0IjoxNjE2NjUzODcyLCJleHAiOjE2MTY2NTM4ODJ9.a1jLRQkO5TV5y5ERcaPAiM9Xm2gBdRjKrrCpHkGr_8M',
         '$Zs.ewu.su84',
         'ks64$S/9.dy$§kz.3sd73b',
+        '.eyJsb3JlbSI6Imlwc3VtIn0.ymiJSsMJXR6tMSr8G9usjQ15_8hKPDv_CArLhxw28MI',
+        'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..ymiJSsMJXR6tMSr8G9usjQ15_8hKPDv_CArLhxw28MI',
+        '..',
       ],
       error: [
         [],