Prevent upgrade error should a plugin get disabled during the Matomo 4 upgrade (#16468)

1 files changed, 8 insertions, 0 deletions

diff --git a/core/API/Proxy.php b/core/API/Proxy.php
index ccd4bfeeaf..cacf4e4ce7 100644
--- a/core/API/Proxy.php
+++ b/core/API/Proxy.php
@@ -18,6 +18,14 @@ use Piwik\Plugin\Manager;
 use ReflectionClass;
 use ReflectionMethod;
 
+// prevent upgrade error eg from Matomo 3.x to Matomo 4.x. Refs https://github.com/matomo-org/matomo/pull/16468
+// the `false` is important otherwise it would fail and try to load the proxy.php file again.
+if (!class_exists('Piwik\API\NoDefaultValue', false)) {
+    class NoDefaultValue
+    {
+    }
+}
+
 /**
  * Proxy is a singleton that has the knowledge of every method available, their parameters
  * and default values.