diff --git a/src/Execution/Values.php b/src/Execution/Values.php
index 257298f..192c0d9 100644
--- a/src/Execution/Values.php
+++ b/src/Execution/Values.php
@@ -88,7 +88,7 @@ public static function coerceVariableValues(Schema $schema, array $variableDefin
             }catch (GraphQLError $error){
                 // add node to error when coercing input variable failed
                 throw new ValidationError(
-                    "Cannot coerce input value of type \"{$varType->getName()}\"." .
+                    "Cannot coerce input value of type \"{$varType->getName()}\". " .
                     $error->getMessage(),
                     $varDefNode);
             }