diff --git a/src/ControlStructure/BlockToken.php b/src/ControlStructure/BlockToken.php
index f02787e..e369781 100644
--- a/src/ControlStructure/BlockToken.php
+++ b/src/ControlStructure/BlockToken.php
@@ -30,7 +30,7 @@ class BlockToken implements ControlStructure {
                         } 
                         catch(\TypeError \$ex) {
                             throw new \Exception(
-                                sprintf('A block awaiting arguments `%s` instead received `%s` with values `%s`', '$arguments', implode(', ', array_map('gettype', \$inlineVariables)), json_encode(\$inlineVariables))
+                                sprintf('A block awaiting arguments `%s` instead received `%s` with values `%s`', '$arguments', implode(', ', array_map('gettype', \$inlineVariables ?? [])), json_encode(\$inlineVariables))
                             );
                         }
                     ?>