diff --git a/src/Entity/PageVariant.php b/src/Entity/PageVariant.php
index a092d52..c1198c8 100644
--- a/src/Entity/PageVariant.php
+++ b/src/Entity/PageVariant.php
@@ -125,9 +125,9 @@ class PageVariant extends ConfigEntityBase implements PageVariantInterface {
   /**
    * An array of collected contexts.
    *
-   * @var \Drupal\Component\Plugin\Context\ContextInterface[]
+   * @var \Drupal\Component\Plugin\Context\ContextInterface[]|null
    */
-  protected $contexts = [];
+  protected $contexts = NULL;
 
   /**
    * Static context references.
@@ -254,7 +254,7 @@ public function getPage() {
    * {@inheritdoc}
    */
   public function getContexts() {
-    if (!$this->contexts) {
+    if (is_null($this->contexts)) {
       $static_contexts = $this->getContextMapper()->getContextValues($this->getStaticContexts());
       $page_contexts = $this->getPage()->getContexts();
       $this->contexts = array_merge($static_contexts, $page_contexts);
@@ -263,6 +263,16 @@ public function getContexts() {
   }
 
   /**
+   * Resets the collected contexts.
+   *
+   * @return $this
+   */
+  protected function resetCollectedContexts() {
+    $this->contexts = NULL;
+    return $this;
+  }
+
+  /**
    * {@inheritdoc}
    */
   public function getWeight() {
@@ -347,6 +357,7 @@ public function getStaticContext($name) {
    */
   public function setStaticContext($name, $configuration) {
     $this->static_context[$name] = $configuration;
+    $this->resetCollectedContexts();
     return $this;
   }
 
@@ -355,6 +366,7 @@ public function setStaticContext($name, $configuration) {
    */
   public function removeStaticContext($name) {
     unset($this->static_context[$name]);
+    $this->resetCollectedContexts();
     return $this;
   }
 
diff --git a/tests/src/Unit/PageVariantTest.php b/tests/src/Unit/PageVariantTest.php
index f7279d2..cfe8ead 100644
--- a/tests/src/Unit/PageVariantTest.php
+++ b/tests/src/Unit/PageVariantTest.php
@@ -65,11 +65,13 @@ protected function setUp() {
    * @dataProvider providerTestGetContexts
    */
   public function testGetContexts($static_contexts, $page_contexts, $expected) {
-    $this->contextMapper->getContextValues([])->willReturn($static_contexts);
-    $this->page->getContexts()->willReturn($page_contexts);
+    $this->contextMapper->getContextValues([])->willReturn($static_contexts)->shouldBeCalledTimes(1);
+    $this->page->getContexts()->willReturn($page_contexts)->shouldBeCalledTimes(1);
 
     $contexts = $this->pageVariant->getContexts();
     $this->assertSame($expected, $contexts);
+    $contexts = $this->pageVariant->getContexts();
+    $this->assertSame($expected, $contexts);
   }
 
   public function providerTestGetContexts() {
@@ -92,4 +94,20 @@ public function providerTestGetContexts() {
     return $data;
   }
 
+  /**
+   * @covers ::getContexts
+   * @covers ::removeStaticContext
+   */
+  public function testGetContextsAfterReset() {
+    $this->contextMapper->getContextValues([])->willReturn([])->shouldBeCalledTimes(2);
+    $this->page->getContexts()->willReturn([])->shouldBeCalledTimes(2);
+
+    $expected = [];
+    $contexts = $this->pageVariant->getContexts();
+    $this->assertSame($expected, $contexts);
+    $this->pageVariant->removeStaticContext('anything');
+    $contexts = $this->pageVariant->getContexts();
+    $this->assertSame($expected, $contexts);
+  }
+
 }