diff --git a/src/testing.c b/src/testing.c
index 09718760a8..ed2d511f2c 100644
--- a/src/testing.c
+++ b/src/testing.c
@@ -615,7 +615,8 @@ f_assert_fails(typval_T *argvars, typval_T *rettv)
 	    goto theend;
 	}
 
-	if (!error_found && argvars[3].v_type == VAR_NUMBER
+	if (!error_found && argvars[2].v_type != VAR_UNKNOWN
+		&& argvars[3].v_type == VAR_NUMBER
 		&& argvars[3].vval.v_number >= 0
 		&& argvars[3].vval.v_number != emsg_assert_fails_lnum)
 	{
diff --git a/src/version.c b/src/version.c
index 028b910a18..80f464a36d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1484,
 /**/
     1483,
 /**/