Index: contrib/abcl-asdf/maven-embedder.lisp
===================================================================
--- contrib/abcl-asdf/maven-embedder.lisp       (revision 14204)
+++ contrib/abcl-asdf/maven-embedder.lisp       (working copy)
@@ -149,7 +149,8 @@
   "Run the initialization strategy to bootstrap a Maven dependency node."
   (unless (or force *mvn-libs-directory*)
     (setf *mvn-libs-directory* (find-mvn-libs)))
-  (unless (probe-file *mvn-libs-directory*)
+  (unless (and *mvn-libs-directory*
+               (probe-file *mvn-libs-directory*))
     (error "You must download maven-3.0.4 or later from http://maven.apache.org/download.html, then set ABCL-ASDF:*MVN-DIRECTORY* appropiately."))
   (unless (ensure-mvn-version)
     (error "We need maven-3.0.4 or later."))