diff --git a/MatomoTracker.php b/MatomoTracker.php
index e3efc8f..fe3a0b0 100644
--- a/MatomoTracker.php
+++ b/MatomoTracker.php
@@ -1620,7 +1620,7 @@ protected function sendRequest($url, $method = 'GET', $data = null, $force = fal
 
         $forcePostUrlEncoded = false;
         if (!$this->doBulkRequests) {
-            if (strtoupper($this->requestMethod) === 'POST') {
+            if (!empty($this->requestMethod) && strtoupper($this->requestMethod) === 'POST') {
                 // POST ALL parameters and have no GET parameters
                 $urlParts = explode('?', $url);