diff --git a/src/misc2.c b/src/misc2.c
index 4918189..5fc2040 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -4356,7 +4356,10 @@
 	    int i;
 
 	    for (i = 0; i < *argc; ++i)
+	    {
 		vim_free((*argv)[i]);
+		(*argv)[i] = NULL;
+	    }
 	    return FAIL;
 	}
 	(*argv)[*argc] = (char *)vim_strsave(s);
diff --git a/src/testdir/test_channel.vim b/src/testdir/test_channel.vim
index 11f3362..af809ec 100644
--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -1681,6 +1681,7 @@
   call assert_fails('let job = job_start(["   "])', 'E474:')
   call assert_fails('let job = job_start("")', 'E474:')
   call assert_fails('let job = job_start("   ")', 'E474:')
+  call assert_fails('let job = job_start(["ls", []])', 'E730:')
   %bw!
 endfunc
 
diff --git a/src/version.c b/src/version.c
index df1dcec..40e048d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    571,
+/**/
     570,
 /**/
     569,