--- old/src/share/back/transport.c	2013-03-04 19:20:08.373722113 +0100
+++ new/src/share/back/transport.c	2013-03-04 19:20:08.221722106 +0100
@@ -117,6 +117,9 @@
 
     /* Construct library name (simple name or full path) */
     dbgsysBuildLibName(libname, sizeof(libname), plibdir, name);
+    if (strlen(libname) == 0) {
+        return NULL;
+    }
 
     /* dlopen (unix) / LoadLibrary (windows) the transport library */
     handle = dbgsysLoadLibrary(libname, buf, sizeof(buf));