commit - a2660887c0d607989b8a50822d8882140072a6a5
commit + 5d32c407ba9b6563dd3fc1f594e268a102691c26
blob - 07ce503a22184efb8e4b69555f2e8bcb3bf7223d
blob + 37cce3f7cb588fb53efb7d23ca111bbc09286dba
--- src/cmd/acme/acme.c
+++ src/cmd/acme/acme.c
@@ -1068,6 +1068,9 @@ ismtpt(char *file)
 {
 	int n;
 
+	if(mtpt == nil)
+		return 0;
+
 	/* This is not foolproof, but it will stop a lot of them. */
 	n = strlen(mtpt);
 	return strncmp(file, mtpt, n) == 0 && ((n > 0 && mtpt[n-1] == '/') || file[n] == '/' || file[n] == 0);