diff -Nur zorba-2.9.1/src/context/root_static_context.cpp zorba-2.9.1~/src/context/root_static_context.cpp
--- zorba-2.9.1/src/context/root_static_context.cpp	2013-05-29 03:47:42.000000000 -0400
+++ zorba-2.9.1~/src/context/root_static_context.cpp	2014-02-25 10:47:01.704314908 -0500
@@ -99,6 +99,8 @@
     std::vector<zstring>& pathsVector)
 {
   char* dll_path = getenv(env_var_name);
+  if (dll_path == NULL)
+    return;
   char* str_env = std::strtok(dll_path, ";");
   while (str_env !=NULL)
   {