auth0
diff --git a/‎sign.js
+6-1 b/‎sign.js
+6-1
@@ -147,7 +147,12 @@ module.exports = function (payload, secretOrPrivateKey, options, callback) {
   }
 
   if (typeof options.notBefore !== 'undefined') {
-    payload.nbf = timespan(options.notBefore, timestamp);
+    try {
+      payload.nbf = timespan(options.notBefore, timestamp);
+    }
+    catch (err) {
+      return failure(err);
+    }
     if (typeof payload.nbf === 'undefined') {
       return failure(new Error('"notBefore" should be a number of seconds or string representing a timespan eg: "1d", "20h", 60'));
     }
Original file line number	Diff line number	Diff line change
`@@ -147,7 +147,12 @@ module.exports = function (payload, secretOrPrivateKey, options, callback) {`
`147`	`147`	`}`
`148`	`148`
`149`	`149`	`if (typeof options.notBefore !== 'undefined') {`
`150`		`- payload.nbf = timespan(options.notBefore, timestamp);`
	`150`	`+ try {`
	`151`	`+ payload.nbf = timespan(options.notBefore, timestamp);`
	`152`	`+ }`
	`153`	`+ catch (err) {`
	`154`	`+ return failure(err);`
	`155`	`+ }`
`151`	`156`	`if (typeof payload.nbf === 'undefined') {`
`152`	`157`	`return failure(new Error('"notBefore" should be a number of seconds or string representing a timespan eg: "1d", "20h", 60'));`
`153`	`158`	`}`