possibly better

Author: j4qfrost

lib/src/substituter.dart

@@ -55,8 +55,11 @@ class PostgreSQLFormat {
   static String substitute(String fmtString, Map<String, dynamic>? values,
       {SQLReplaceIdentifierFunction? replace}) {
     final converter = PostgresTextEncoder();
-    values ??= const {};
-    replace ??= (spec, index) => converter.convert(values![spec.name]);
+    if (values != null) {
+      replace ??= (spec, index) => converter.convert(values[spec.name]);
+    } else {
+      replace = (spec, index) => '';
+    }
 
     final items = <PostgreSQLFormatToken>[];
     PostgreSQLFormatToken? currentPtr;