diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/Call/ArgumentsAnalyzer.php b/src/Psalm/Internal/Analyzer/Statements/Expression/Call/ArgumentsAnalyzer.php
index 5965782516d..c72588933a9 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/Call/ArgumentsAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/Call/ArgumentsAnalyzer.php
@@ -832,7 +832,11 @@ public static function checkArgumentsMatch(
                         $has_unpacked_non_keyed_array = true;
                     }
 
-                    $key_types = $array_type->type_params[0]->getAtomicTypes();
+                    if (isset($array_type->type_params)) {
+                        $key_types = $array_type->type_params[0]->getAtomicTypes();
+                    } elseif ($array_type instanceof Type\Atomic\TClassStringMap) {
+                        $key_types = Type::getNonFalsyString();
+                    }
 
                     if ($array_type->type_params[0]->isString()) {
                         $named_args_was_used = true;