diff --git a/CHANGELOG.md b/CHANGELOG.md
index 121daa7f0..35fdff1f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,7 @@
     * Escape titles in Flex pages list [flex-objects#84](https://github.com/trilbymedia/grav-plugin-flex-objects/issues/84)
     * Fixed Purge successful message only working in Scheduler but broken in CLI and Admin [#1935](https://github.com/getgrav/grav-plugin-admin/issues/1935)
     * Fixed `system://` stream is causing issues in Admin, making Media tab to disappear and possibly causing other issues [#3072](https://github.com/getgrav/grav/issues/3072)
+    * Fixed CLI self-upgrade from Grav 1.6 [#3079](https://github.com/getgrav/grav/issues/3079)
 
 # v1.7.0-rc.17
 ## 10/07/2020
diff --git a/system/src/Grav/Common/Processors/InitializeProcessor.php b/system/src/Grav/Common/Processors/InitializeProcessor.php
index de2095bf2..05a4b6497 100644
--- a/system/src/Grav/Common/Processors/InitializeProcessor.php
+++ b/system/src/Grav/Common/Processors/InitializeProcessor.php
@@ -331,7 +331,10 @@ protected function initializePages(Config $config): Pages
 
         /** @var Pages $pages */
         $pages = $grav['pages'];
-        $pages->register();
+        // Upgrading from older Grav versions won't work without checking if the method exists.
+        if (method_exists($pages, 'register')) {
+            $pages->register();
+        }
 
         $this->stopTimer('_init_pages_register');