diff --git a/api/js/etemplate/Et2Url/Et2UrlEmail.ts b/api/js/etemplate/Et2Url/Et2UrlEmail.ts
index c95e538327..6968b76004 100644
--- a/api/js/etemplate/Et2Url/Et2UrlEmail.ts
+++ b/api/js/etemplate/Et2Url/Et2UrlEmail.ts
@@ -49,7 +49,7 @@ export class Et2UrlEmail extends Et2InvokerMixin(Et2Textbox)
 
 	static action(value)
 	{
-		if (egw.user('apps').mail && egw.preference('force_mailto','addressbook') != '1' )
+		if (value && egw.user('apps').mail && egw.preference('force_mailto','addressbook') != '1' )
 		{
 			egw.open_link('mailto:'+value);
 		}
diff --git a/api/js/etemplate/Et2Url/Et2UrlPhone.ts b/api/js/etemplate/Et2Url/Et2UrlPhone.ts
index fe34bf0056..ccdacb6e54 100644
--- a/api/js/etemplate/Et2Url/Et2UrlPhone.ts
+++ b/api/js/etemplate/Et2Url/Et2UrlPhone.ts
@@ -51,6 +51,8 @@ export class Et2UrlPhone extends Et2InvokerMixin(Et2Textbox)
 		// remove everything but numbers and plus, as telephon software might not like it
 		value = value.replace(/[^0-9+]/g, '');
 
+		if (!value) return;	// don't try to dial an empty number
+
 		// mobile Webkit (iPhone, Android) have precedence over server configuration!
 		if (navigator.userAgent.indexOf('AppleWebKit') !== -1 &&
 			(navigator.userAgent.indexOf("iPhone") !== -1 || navigator.userAgent.indexOf("Android") !== -1))