diff --git a/src/Database/Concerns/ValidatesDatabaseParameters.php b/src/Database/Concerns/ValidatesDatabaseParameters.php
index 90807e4b..26580fa5 100644
--- a/src/Database/Concerns/ValidatesDatabaseParameters.php
+++ b/src/Database/Concerns/ValidatesDatabaseParameters.php
@@ -67,13 +67,17 @@ trait ValidatesDatabaseParameters
         $allowedCharacters ??= static::allowedParameterCharacters();
 
         foreach ((array) $parameters as $parameter) {
-            if (! is_string($parameter)) {
+            if (is_null($parameter)) {
                 // Skip if there's nothing to validate
                 // (e.g. when $tenant->database()->getUsername() of an
                 // improperly created tenant is null and it gets passed).
                 continue;
             }
 
+            if (! is_string($parameter)) {
+                throw new InvalidArgumentException("Parameter has to be a string.");
+            }
+
             foreach (str_split($parameter) as $character) {
                 if (! str_contains($allowedCharacters, $character)) {
                     throw new InvalidArgumentException("Forbidden character '{$character}' in parameter.");