diff --git a/libs/sysplugins/smarty_internal_compile_function.php b/libs/sysplugins/smarty_internal_compile_function.php
index d0f2b0f4..84e9584d 100644
--- a/libs/sysplugins/smarty_internal_compile_function.php
+++ b/libs/sysplugins/smarty_internal_compile_function.php
@@ -157,7 +157,7 @@ class Smarty_Internal_Compile_Functionclose extends Smarty_Internal_CompileBase
             $output = "<?php echo \"/*%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/<?php ";
             $output .= "\\\$_smarty_tpl->smarty->ext->_tplFunction->restoreTemplateVariables(\\\$_smarty_tpl, '{$_name}');?>\n";
             $output .= "/*/%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/\";\n?>";
-            $output .= "<?php echo str_replace('{$compiler->template->compiled->nocache_hash}', \$_smarty_tpl->compiled->nocache_hash, ob_get_clean());\n";
+            $output .= "<?php echo str_replace('{$compiler->template->compiled->nocache_hash}', \$_smarty_tpl->compiled->nocache_hash ?? '', ob_get_clean());\n";
             $output .= "}\n}\n";
             $output .= "/*/ {$_funcName}_nocache */\n\n";
             $output .= "?>\n";
diff --git a/libs/sysplugins/smarty_internal_config_file_compiler.php b/libs/sysplugins/smarty_internal_config_file_compiler.php
index 90c5dcef..a9b940e5 100644
--- a/libs/sysplugins/smarty_internal_config_file_compiler.php
+++ b/libs/sysplugins/smarty_internal_config_file_compiler.php
@@ -158,7 +158,7 @@ class Smarty_Internal_Config_File_Compiler
         }
         // template header code
         $template_header =
-            "<?php /* Smarty version " . Smarty::SMARTY_VERSION . ", created on " . strftime("%Y-%m-%d %H:%M:%S") .
+            "<?php /* Smarty version " . Smarty::SMARTY_VERSION . ", created on " . date("Y-m-d H:i:s") .
             "\n";
         $template_header .= "         compiled from '{$this->template->source->filepath}' */ ?>\n";
         $code = '<?php $_smarty_tpl->smarty->ext->configLoad->_loadConfigVars($_smarty_tpl, ' .
diff --git a/libs/sysplugins/smarty_internal_runtime_codeframe.php b/libs/sysplugins/smarty_internal_runtime_codeframe.php
index 983ca618..b5361c9b 100644
--- a/libs/sysplugins/smarty_internal_runtime_codeframe.php
+++ b/libs/sysplugins/smarty_internal_runtime_codeframe.php
@@ -45,7 +45,7 @@ class Smarty_Internal_Runtime_CodeFrame
             $properties[ 'cache_lifetime' ] = $_template->cache_lifetime;
         }
         $output = "<?php\n";
-        $output .= "/* Smarty version {$properties[ 'version' ]}, created on " . strftime("%Y-%m-%d %H:%M:%S") .
+        $output .= "/* Smarty version {$properties[ 'version' ]}, created on " . date("Y-m-d H:i:s") .
                    "\n  from '" . str_replace('*/', '* /', $_template->source->filepath) . "' */\n\n";
         $output .= "/* @var Smarty_Internal_Template \$_smarty_tpl */\n";
         $dec = "\$_smarty_tpl->_decodeProperties(\$_smarty_tpl, " . var_export($properties, true) . ',' .
diff --git a/libs/sysplugins/smarty_internal_templatecompilerbase.php b/libs/sysplugins/smarty_internal_templatecompilerbase.php
index 6a8dc9c4..27261614 100644
--- a/libs/sysplugins/smarty_internal_templatecompilerbase.php
+++ b/libs/sysplugins/smarty_internal_templatecompilerbase.php
@@ -1135,7 +1135,7 @@ abstract class Smarty_Internal_TemplateCompilerBase
             flush();
         }
         $e = new SmartyCompilerException($error_text);
-        $e->line = $line;
+        $e->setLine($line);
         $e->source = trim(preg_replace('![\t\r\n]+!', ' ', $match[ $line - 1 ]));
         $e->desc = $args;
         $e->template = $this->template->source->filepath;
diff --git a/libs/sysplugins/smartycompilerexception.php b/libs/sysplugins/smartycompilerexception.php
index f7ad39b9..8833aa52 100644
--- a/libs/sysplugins/smartycompilerexception.php
+++ b/libs/sysplugins/smartycompilerexception.php
@@ -16,12 +16,12 @@ class SmartyCompilerException extends SmartyException
     }
 
     /**
-     * The line number of the template error
-     *
-     * @type int|null
+     * @param int $line
      */
-    public $line = null;
-
+    public function setLine($line)
+    {
+        $this->line = $line;
+    }
     /**
      * The template source snippet relating to the error
      *
diff --git a/tests/UnitTests/CacheResourceTests/_shared/CacheResourceTestCommon.php b/tests/UnitTests/CacheResourceTests/_shared/CacheResourceTestCommon.php
index 92207d2a..dc4c1cd7 100644
--- a/tests/UnitTests/CacheResourceTests/_shared/CacheResourceTestCommon.php
+++ b/tests/UnitTests/CacheResourceTests/_shared/CacheResourceTestCommon.php
@@ -30,7 +30,8 @@ class CacheResourceTestCommon extends PHPUnit_Smarty
 
     public function compiledPrefilter($text, Smarty_Internal_Template $tpl)
     {
-        return str_replace('#', $tpl->getTemplateVars('test'), $text);
+        $replace = $tpl->getTemplateVars('test');
+        return str_replace('#', $replace ?? '', $text);
     }
 
     /**
diff --git a/tests/UnitTests/ResourceTests/Stream/StreamResourceTest.php b/tests/UnitTests/ResourceTests/Stream/StreamResourceTest.php
index 6d0201bd..402f0226 100644
--- a/tests/UnitTests/ResourceTests/Stream/StreamResourceTest.php
+++ b/tests/UnitTests/ResourceTests/Stream/StreamResourceTest.php
@@ -234,7 +234,7 @@ class ResourceStream
         $v = &$GLOBALS[$this->varname];
         $l = strlen($data);
         $p = &$this->position;
-        $v = substr($v, 0, $p) . $data . substr($v, $p += $l);
+        $v = substr($v ?? '', 0, $p) . $data . substr($v ?? '', $p += $l);
 
         return $l;
     }
diff --git a/tests/UnitTests/SecurityTests/SecurityTest.php b/tests/UnitTests/SecurityTests/SecurityTest.php
index 4d1b8a3a..dfaffa67 100644
--- a/tests/UnitTests/SecurityTests/SecurityTest.php
+++ b/tests/UnitTests/SecurityTests/SecurityTest.php
@@ -416,7 +416,7 @@ class ResourceStreamSecurity
         $v = &$GLOBALS[$this->varname];
         $l = strlen($data);
         $p = &$this->position;
-        $v = substr($v, 0, $p) . $data . substr($v, $p += $l);
+        $v = substr($v ?? '', 0, $p) . $data . substr($v ?? '', $p += $l);
 
         return $l;
     }
diff --git a/tests/UnitTests/TemplateSource/ValueTests/Variables/Stream/StreamVariableTest.php b/tests/UnitTests/TemplateSource/ValueTests/Variables/Stream/StreamVariableTest.php
index e49d6205..18560ba8 100644
--- a/tests/UnitTests/TemplateSource/ValueTests/Variables/Stream/StreamVariableTest.php
+++ b/tests/UnitTests/TemplateSource/ValueTests/Variables/Stream/StreamVariableTest.php
@@ -96,7 +96,7 @@ class VariableStream
         $v = &$GLOBALS[$this->varname];
         $l = strlen($data);
         $p = &$this->position;
-        $v = substr($v, 0, $p) . $data . substr($v, $p += $l);
+        $v = substr($v ?? '', 0, $p) . $data . substr($v ?? '', $p += $l);
 
         return $l;
     }