diff --git a/lib/php/libsdk/SDK/Config.php b/lib/php/libsdk/SDK/Config.php
index 89f3d8d..3aea0c7 100644
--- a/lib/php/libsdk/SDK/Config.php
+++ b/lib/php/libsdk/SDK/Config.php
@@ -180,7 +180,9 @@ public static function getKnownBranches() : array
 	public static function setCurrentBranchName(string $name) : void
 	{/*{{{*/
 		if (!array_key_exists($name, self::getKnownBranches())) {
-			throw new Exception("Unsupported branch '$name'");
+			fwrite(STDERR, "Unsupported branch '$name'. Falling back to 'master'.");
+
+			$name = 'master';
 		}
 
 		self::$currentBranchName = $name;