diff --git a/lib/CHANGELOG.md b/lib/CHANGELOG.md
index d8be4cfa9..723b8e594 100644
--- a/lib/CHANGELOG.md
+++ b/lib/CHANGELOG.md
@@ -1,5 +1,11 @@
 CHANGELOG
 
+3.7.1 (30. Dezember 2019)
+*   Base->build: Add support for brace-enclosed route tokens
+*   Base->reroute, fix duplicate fragment issue on non-alias routes
+*   DB\SQL\Mapper: fix empty check for pkey when reloading after insert
+*   Web->minify: fix minification with multiple files, [bcosca/fatfree#1152](https://github.com/bcosca/fatfree/issues/1152), [#bcosca/fatfree#1169](https://github.com/bcosca/fatfree/issues/1169)
+
 3.7.0 (26. November 2019)
 *   NEW: Matrix, added select and walk methods for array processing and validation tools
 *   NEW: Added configurable file locking via LOCK var
diff --git a/lib/base.php b/lib/base.php
index 18219a42a..e8234d6ba 100644
--- a/lib/base.php
+++ b/lib/base.php
@@ -45,7 +45,7 @@ final class Base extends Prefab implements ArrayAccess {
 	//@{ Framework details
 	const
 		PACKAGE='Fat-Free Framework',
-		VERSION='3.7.0-Release';
+		VERSION='3.7.1-Release';
 	//@}
 
 	//@{ HTTP status codes (RFC 2616)
@@ -177,17 +177,17 @@ function build($url,$args=[]) {
 			}
 		else {
 			$i=0;
-			$url=preg_replace_callback('/@(\w+)|(\*)/',
+			$url=preg_replace_callback('/(\{)?@(\w+)(?(1)\})|(\*)/',
 				function($match) use(&$i,$args) {
-					if (isset($match[1]) &&
-						array_key_exists($match[1],$args))
-						return $args[$match[1]];
 					if (isset($match[2]) &&
-						array_key_exists($match[2],$args)) {
-						if (!is_array($args[$match[2]]))
-							return $args[$match[2]];
+						array_key_exists($match[2],$args))
+						return $args[$match[2]];
+					if (isset($match[3]) &&
+						array_key_exists($match[3],$args)) {
+						if (!is_array($args[$match[3]]))
+							return $args[$match[3]];
 						$i++;
-						return $args[$match[2]][$i-1];
+						return $args[$match[3]][$i-1];
 					}
 					return $match[0];
 				},$url);
@@ -1486,12 +1486,11 @@ function reroute($url=NULL,$permanent=FALSE,$die=TRUE) {
 			$url=$this->hive['REALM'];
 		if (is_array($url))
 			$url=call_user_func_array([$this,'alias'],$url);
-		elseif (preg_match('/^(?:@?([^\/()?#]+)(?:\((.+?)\))*(\?[^#]+)*(#.+)*)/',
-			$url,$parts) &&
-			isset($this->hive['ALIASES'][$parts[1]]))
-			$url=$this->hive['ALIASES'][$parts[1]];
-		$url=$this->build($url,isset($parts[2])?$this->parse($parts[2]):[]).
-			(isset($parts[3])?$parts[3]:'').(isset($parts[4])?$parts[4]:'');
+		elseif (preg_match('/^(?:@([^\/()?#]+)(?:\((.+?)\))*(\?[^#]+)*(#.+)*)/',
+			$url,$parts) && isset($this->hive['ALIASES'][$parts[1]]))
+			$url=$this->build($this->hive['ALIASES'][$parts[1]],
+					isset($parts[2])?$this->parse($parts[2]):[]).
+				(isset($parts[3])?$parts[3]:'').(isset($parts[4])?$parts[4]:'');
 		if (($handler=$this->hive['ONREROUTE']) &&
 			$this->call($handler,[$url,$permanent,$die])!==FALSE)
 			return;
@@ -2888,7 +2887,7 @@ protected function sandbox(array $hive=NULL,$mime=NULL) {
 	function render($file,$mime='text/html',array $hive=NULL,$ttl=0) {
 		$fw=$this->fw;
 		$cache=Cache::instance();
-		foreach (array_unique($fw->split($fw->UI)) as $dir) {
+		foreach ($fw->split($fw->UI) as $dir) {
 			if ($cache->exists($hash=$fw->hash($dir.$file),$data))
 				return $data;
 			if (is_file($this->file=$fw->fixslashes($dir.$file))) {
@@ -3100,7 +3099,7 @@ function render($file,$mime='text/html',array $hive=NULL,$ttl=0) {
 		$cache=Cache::instance();
 		if (!is_dir($tmp=$fw->TEMP))
 			mkdir($tmp,Base::MODE,TRUE);
-		foreach (array_unique($fw->split($fw->UI)) as $dir) {
+		foreach ($fw->split($fw->UI) as $dir) {
 			if ($cache->exists($hash=$fw->hash($dir.$file),$data))
 				return $data;
 			if (is_file($view=$fw->fixslashes($dir.$file))) {
diff --git a/lib/db/sql/mapper.php b/lib/db/sql/mapper.php
index 930f6e57c..ea041de88 100644
--- a/lib/db/sql/mapper.php
+++ b/lib/db/sql/mapper.php
@@ -447,7 +447,7 @@ function insert() {
 			if ($field['pkey']) {
 				$field['previous']=$field['value'];
 				if (!$inc && $field['pdo_type']==\PDO::PARAM_INT &&
-					empty($field['value']) && !$field['nullable'])
+					is_null($field['value']) && !$field['nullable'])
 					$inc=$key;
 				$filter.=($filter?' AND ':'').$this->db->quotekey($key).'=?';
 				$nkeys[$nctr+1]=[$field['value'],$field['pdo_type']];
diff --git a/lib/web.php b/lib/web.php
index 8f6ddf70c..373954bc3 100644
--- a/lib/web.php
+++ b/lib/web.php
@@ -694,10 +694,11 @@ function minify($files,$mime=NULL,$header=TRUE,$path=NULL) {
 		if (!isset($path))
 			$path=$fw->UI.';./';
 		foreach (array_unique($fw->split($path,FALSE)) as $dir)
-			foreach ($files as $file)
+			foreach ($files as $i=>$file)
 				if (is_file($save=$fw->fixslashes($dir.$file)) &&
 					is_bool(strpos($save,'../')) &&
 					preg_match('/\.(css|js)$/i',$file)) {
+					unset($files[$i]);
 					if ($fw->CACHE &&
 						($cached=$cache->exists(
 							$hash=$fw->hash($save).'.'.$ext[0],$data)) &&
@@ -815,7 +816,6 @@ function minify($files,$mime=NULL,$header=TRUE,$path=NULL) {
 							$cache->set($hash,$data);
 						$dst.=$data;
 					}
-					break;
 				}
 		if (PHP_SAPI!='cli' && $header)
 			header('Content-Type: '.$mime.'; charset='.$fw->ENCODING);