diff --git a/htdocs/core/lib/memory.lib.php b/htdocs/core/lib/memory.lib.php
index ce603415009..1300c1b771f 100644
--- a/htdocs/core/lib/memory.lib.php
+++ b/htdocs/core/lib/memory.lib.php
@@ -93,7 +93,7 @@ function dol_setcache($memoryid, $data, $expire = 0)
 		$dolmemcache->add($memoryid, $data, $expire); // This fails if key already exists
 		$rescode = $dolmemcache->getResultCode();
 		if ($rescode == 0) {
-			return count($data);
+			return is_countable($data) ? count($data) : 0;
 		} else {
 			return -$rescode;
 		}
@@ -113,7 +113,7 @@ function dol_setcache($memoryid, $data, $expire = 0)
 		//$dolmemcache->setOption(Memcached::OPT_COMPRESSION, false);
 		$result = $dolmemcache->add($memoryid, $data, false, $expire); // This fails if key already exists
 		if ($result) {
-			return count($data);
+			return is_countable($data) ? count($data) : 0;
 		} else {
 			return -1;
 		}
diff --git a/htdocs/master.inc.php b/htdocs/master.inc.php
index c63ace353b3..371d687b9b7 100644
--- a/htdocs/master.inc.php
+++ b/htdocs/master.inc.php
@@ -35,6 +35,17 @@
 require_once 'filefunc.inc.php'; // May have been already require by main.inc.php. But may not by scripts.
 
 
+if (!function_exists('is_countable')) {
+	/**
+	 * function is_countable (to remove when php version supported will be >= 7.3)
+	 * @param mixed $c data to check if countable
+	 * @return bool
+	 */
+	function is_countable($c)
+	{
+		return is_array($c) || $c instanceof Countable;
+	}
+}
 
 /*
  * Create $conf object