diff --git a/_test/topic_and_tagrefine.test.php b/_test/topic_and_tagrefine.test.php
index b466eb3..b6864e1 100644
--- a/_test/topic_and_tagrefine.test.php
+++ b/_test/topic_and_tagrefine.test.php
@@ -4,6 +4,8 @@
 
 /**
  * Tests the tagRefine function of the tag plugin
+ * 
+ * @group plugin_tag
  */
 class plugin_tag_topic_and_tagrefine_test extends DokuWikiTest {
     private $all_pages = array(
@@ -44,7 +46,10 @@ public function testOnlyNegative() {
 
     public function testMixed() {
         $this->assertTopicRefine(array('tagged_page'), 'mytag -negative_tag');
+    }
 
+    public function testMixedReversed() {
+        $this->assertTopicRefine(array('tagged_page', 'negative_page', 'third_page'), '-negative_tag mytag');
     }
 
     public function testAnd() {
@@ -97,6 +102,7 @@ private function hasPages($expected, $actual, $msg_prefix = '') {
                     break;
                 }
             }
+            $this->assertTrue((count($actual) > 0), $msg_prefix.'Result list is empty!');
             $this->assertTrue($found, $msg_prefix.'Page '.$id.' expected but not found in the result');
         }
 
diff --git a/_test/topic_sort.test.php b/_test/topic_sort.test.php
index aca59f4..767b671 100644
--- a/_test/topic_sort.test.php
+++ b/_test/topic_sort.test.php
@@ -4,6 +4,8 @@
 
 /**
  * Tests the tagRefine function of the tag plugin
+ * 
+ * @group plugin_tag
  */
 class plugin_tag_topic_sorting_test extends DokuWikiTest {
     private $pages = array(
diff --git a/_test/topic_tag.test.php b/_test/topic_tag.test.php
index 63908aa..58e1c73 100644
--- a/_test/topic_tag.test.php
+++ b/_test/topic_tag.test.php
@@ -2,6 +2,8 @@
 
 /**
  * Tests the basic functionality of the tag and topic syntax
+ * 
+ * @group plugin_tag
  */
 class topic_tag_test extends DokuWikiTest {
     function setup() {
diff --git a/helper.php b/helper.php
index 251e093..75ed517 100644
--- a/helper.php
+++ b/helper.php
@@ -507,12 +507,39 @@ function _tagCompare($tag1, $tag2) {
      * @return bool
      */
     function _checkPageTags($pagetags, $tags) {
+        if (count($tags) == 0) return true;
         $result = false;
-        foreach($tags as $tag) {
-            if ($tag{0} == "+" and !in_array(substr($tag, 1), $pagetags)) $result = false;
-            if ($tag{0} == "-" and in_array(substr($tag, 1), $pagetags)) $result = false;
+        $NOTs = 0;
+        $falseNOTs = 0;
+        foreach($tags as $i => $tag) {
+            if ($tag{0} == "+") {
+                if (!in_array(substr($tag, 1), $pagetags)) {
+                    $result = false;
+                } else if ($i == 0) {
+                    // This can happen e.g. in case of a tag list like "+tag1"
+                    // or "+tag1 tag2". If the first tag has a '+' handle
+                    // it like a normal tag, so we set $result to 'true'.
+                    // Also solves situations like "+tag1 +tag2".
+                    $result = true;
+                }
+            }
+            if ($tag{0} == "-") {
+                $NOTs++;
+                if (in_array(substr($tag, 1), $pagetags)) {
+                    $result = false;
+                    $falseNOTs++;
+                } else if ($i == 0) {
+                    $result = true;
+                }
+            }
             if (in_array($tag, $pagetags)) $result = true;
         }
+        if ($falseNOTs == 0 && count($tags) == $NOTs) {
+            // None of the NOT(-) tags were found (OK) and ALL
+            // tags are NOT tags. Set true because there is no
+            // tag which could cause $result to become true!
+            $result = true;
+        }
         return $result;
     }