diff --git a/change_log.txt b/change_log.txt
index 1ca9a5f6..b1480b6f 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -2,7 +2,8 @@
  13.07.2016
   - bugfix PHP 7 compatibility on registered compiler plugins https://github.com/smarty-php/smarty/issues/241
   - update testInstall() https://github.com/smarty-php/smarty/issues/248https://github.com/smarty-php/smarty/issues/248
-    
+  - bugfix enable debugging could fail when template objects did already exists https://github.com/smarty-php/smarty/issues/237
+  
  12.07.2016
   - bugfix {foreach} item variable must be created also on empty from array https://github.com/smarty-php/smarty/issues/238 and https://github.com/smarty-php/smarty/issues/239
   - bugfix enableSecurity() must init cache flags https://github.com/smarty-php/smarty/issues/247
diff --git a/libs/Smarty.class.php b/libs/Smarty.class.php
index 4b2f3855..904ecd7d 100644
--- a/libs/Smarty.class.php
+++ b/libs/Smarty.class.php
@@ -121,7 +121,7 @@ class Smarty extends Smarty_Internal_TemplateBase
     /**
      * smarty version
      */
-    const SMARTY_VERSION = '3.1.30-dev/76';
+    const SMARTY_VERSION = '3.1.30-dev/77';
 
     /**
      * define variable scopes
diff --git a/libs/sysplugins/smarty_internal_config_file_compiler.php b/libs/sysplugins/smarty_internal_config_file_compiler.php
index 61328ce2..1afb92c3 100644
--- a/libs/sysplugins/smarty_internal_config_file_compiler.php
+++ b/libs/sysplugins/smarty_internal_config_file_compiler.php
@@ -105,6 +105,9 @@ class Smarty_Internal_Config_File_Compiler
             array($this->template->source->filepath, $this->template->source->getTimeStamp(),
                   $this->template->source->type);
         if ($this->smarty->debugging) {
+            if (!isset( $this->smarty->_debug)) {
+                $this->smarty->_debug  = new Smarty_Internal_Debug();
+            }
             $this->smarty->_debug->start_compile($this->template);
         }
         // init the lexer/parser to compile the config file
diff --git a/libs/sysplugins/smarty_internal_template.php b/libs/sysplugins/smarty_internal_template.php
index 35d49d17..4b7f96c0 100644
--- a/libs/sysplugins/smarty_internal_template.php
+++ b/libs/sysplugins/smarty_internal_template.php
@@ -160,6 +160,9 @@ class Smarty_Internal_Template extends Smarty_Internal_TemplateBase
     {
         $parentIsTpl = isset($this->parent) && $this->parent->_objType == 2;
         if ($this->smarty->debugging) {
+            if (!isset($this->smarty->_debug)) {
+                $this->smarty->_debug = new Smarty_Internal_Debug();
+            }
             $this->smarty->_debug->start_template($this, $display);
         }
         // checks if template exists
@@ -339,6 +342,9 @@ class Smarty_Internal_Template extends Smarty_Internal_TemplateBase
         $tpl->_cache = array();
         if (isset($uid)) {
             if ($smarty->debugging) {
+                if (!isset($smarty->_debug)) {
+                    $smarty->_debug = new Smarty_Internal_Debug();
+                }
                 $smarty->_debug->start_template($tpl);
                 $smarty->_debug->start_render($tpl);
             }
diff --git a/libs/sysplugins/smarty_internal_templatecompilerbase.php b/libs/sysplugins/smarty_internal_templatecompilerbase.php
index e2681800..9ce910fd 100644
--- a/libs/sysplugins/smarty_internal_templatecompilerbase.php
+++ b/libs/sysplugins/smarty_internal_templatecompilerbase.php
@@ -360,6 +360,9 @@ abstract class Smarty_Internal_TemplateCompilerBase
                 $this->plugin_search_order = $this->template->smarty->plugin_search_order;
             }
             if ($this->smarty->debugging) {
+                if (!isset($this->smarty->_debug)) {
+                    $this->smarty->_debug = new Smarty_Internal_Debug();
+                }
                 $this->smarty->_debug->start_compile($this->template);
             }
             if (isset($this->template->smarty->security_policy)) {
@@ -588,7 +591,8 @@ abstract class Smarty_Internal_TemplateCompilerBase
                             if (!$this->smarty->registered_plugins[ $plugin_type ][ $tag ][ 1 ]) {
                                 $this->tag_nocache = true;
                             }
-                            return call_user_func_array($this->smarty->registered_plugins[ $plugin_type ][ $tag ][ 0 ], array($new_args, $this));
+                            return call_user_func_array($this->smarty->registered_plugins[ $plugin_type ][ $tag ][ 0 ],
+                                                        array($new_args, $this));
                         }
                         // compile registered function or block function
                         if ($plugin_type == Smarty::PLUGIN_FUNCTION || $plugin_type == Smarty::PLUGIN_BLOCK) {
@@ -661,7 +665,8 @@ abstract class Smarty_Internal_TemplateCompilerBase
                             foreach ($args as $mixed) {
                                 $new_args = array_merge($new_args, $mixed);
                             }
-                            return call_user_func_array($this->default_handler_plugins[ $plugin_type ][ $tag ][ 0 ], array($new_args, $this));
+                            return call_user_func_array($this->default_handler_plugins[ $plugin_type ][ $tag ][ 0 ],
+                                                        array($new_args, $this));
                         } else {
                             return $this->callTagCompiler('private_registered_' . $plugin_type, $args, $parameter,
                                                           $tag);
@@ -712,7 +717,8 @@ abstract class Smarty_Internal_TemplateCompilerBase
                     if (!$this->smarty->registered_plugins[ Smarty::PLUGIN_COMPILER ][ $tag ][ 1 ]) {
                         $this->tag_nocache = true;
                     }
-                    return call_user_func_array($this->smarty->registered_plugins[ Smarty::PLUGIN_COMPILER ][ $tag ][ 0 ], array($args, $this));
+                    return call_user_func_array($this->smarty->registered_plugins[ Smarty::PLUGIN_COMPILER ][ $tag ][ 0 ],
+                                                array($args, $this));
                 }
                 if ($this->smarty->loadPlugin('smarty_compiler_' . $tag)) {
                     $plugin = 'smarty_compiler_' . $tag;
diff --git a/libs/sysplugins/smarty_template_cached.php b/libs/sysplugins/smarty_template_cached.php
index d44c2c43..58f0daf2 100644
--- a/libs/sysplugins/smarty_template_cached.php
+++ b/libs/sysplugins/smarty_template_cached.php
@@ -125,6 +125,9 @@ class Smarty_Template_Cached extends Smarty_Template_Resource_Base
     {
         if ($this->isCached($_template)) {
             if ($_template->smarty->debugging) {
+                if (!isset($_template->smarty->_debug)) {
+                    $_template->smarty->_debug = new Smarty_Internal_Debug();
+                }
                 $_template->smarty->_debug->start_cache($_template);
             }
             if (!$this->processed) {
diff --git a/libs/sysplugins/smarty_template_compiled.php b/libs/sysplugins/smarty_template_compiled.php
index a8a5aaff..01fdc123 100644
--- a/libs/sysplugins/smarty_template_compiled.php
+++ b/libs/sysplugins/smarty_template_compiled.php
@@ -147,6 +147,9 @@ class Smarty_Template_Compiled extends Smarty_Template_Resource_Base
     public function render(Smarty_Internal_Template $_template)
     {
         if ($_template->smarty->debugging) {
+            if (!isset($_template->smarty->_debug)) {
+                $_template->smarty->_debug = new Smarty_Internal_Debug();
+            }
             $_template->smarty->_debug->start_render($_template);
         }
         if (!$this->processed) {