diff --git a/change_log.txt b/change_log.txt
index 268664d5..39653536 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,4 +1,8 @@
 ===== trunk  =====
+30.07.2012
+-bugfix {assign} in a nocache section should not overwrite existing variable values 
+   during compilation (issue 109)
+   
 28.07.2012
 - bugfix array access of config variables did not work (Forum Topic 22527)
 
diff --git a/libs/sysplugins/smarty_internal_compile_assign.php b/libs/sysplugins/smarty_internal_compile_assign.php
index 0ac3f68c..f2dfedfb 100644
--- a/libs/sysplugins/smarty_internal_compile_assign.php
+++ b/libs/sysplugins/smarty_internal_compile_assign.php
@@ -39,7 +39,11 @@ class Smarty_Internal_Compile_Assign extends Smarty_Internal_CompileBase {
         if ($compiler->tag_nocache || $compiler->nocache) {
             $_nocache = 'true';
             // create nocache var to make it know for further compiling
-            $compiler->template->tpl_vars[trim($_attr['var'], "'")] = new Smarty_variable(null, true);
+            if (isset($compiler->template->tpl_vars[trim($_attr['var'], "'")])) {
+                $compiler->template->tpl_vars[trim($_attr['var'], "'")]->nocache = true;
+            } else {
+                $compiler->template->tpl_vars[trim($_attr['var'], "'")] = new Smarty_variable(null, true);
+            }
         }
         // scope setup
         if (isset($_attr['scope'])) {