diff --git a/classes/helpers/FrmAppHelper.php b/classes/helpers/FrmAppHelper.php
index 7c1e6f52e1..4b3ba7ff93 100644
--- a/classes/helpers/FrmAppHelper.php
+++ b/classes/helpers/FrmAppHelper.php
@@ -3682,29 +3682,25 @@ public static function maybe_unserialize_array( $value ) {
 	 * Decode a JSON string.
 	 * Do not switch shortcodes like [24] to array unless intentional ie XML values.
 	 *
-	 * @param mixed $string
-	 * @param bool  $single_to_array
+	 * @param array|string|null $string
+	 * @param bool              $single_to_array
 	 *
-	 * @return mixed
+	 * @return array|string|null
 	 */
 	public static function maybe_json_decode( $string, $single_to_array = true ) {
 		if ( is_array( $string ) || is_null( $string ) ) {
 			return $string;
 		}
 
-		$new_string = json_decode( $string, true );
-
-		if ( function_exists( 'json_last_error' ) ) {
-			// php 5.3+
-			$single_value = false;
+		$new_string   = json_decode( $string, true );
+		$single_value = false;
 
-			if ( ! $single_to_array ) {
-				$single_value = is_array( $new_string ) && count( $new_string ) === 1 && isset( $new_string[0] );
-			}
+		if ( ! $single_to_array ) {
+			$single_value = is_array( $new_string ) && count( $new_string ) === 1 && isset( $new_string[0] );
+		}
 
-			if ( json_last_error() === JSON_ERROR_NONE && is_array( $new_string ) && ! $single_value ) {
-				$string = $new_string;
-			}
+		if ( json_last_error() === JSON_ERROR_NONE && is_array( $new_string ) && ! $single_value ) {
+			$string = $new_string;
 		}
 
 		return $string;
diff --git a/psalm.xml b/psalm.xml
index 2fdb84e2ac..0b30fa49cb 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -520,8 +520,14 @@
 		<PossiblyNullArrayAccess>
 			<errorLevel type="suppress">
 				<file name="classes/controllers/FrmStylesController.php" />
+				<file name="classes/helpers/FrmXMLHelper.php" />
 			</errorLevel>
 		</PossiblyNullArrayAccess>
+		<PossiblyNullArrayAssignment>
+			<errorLevel type="suppress">
+				<file name="classes/helpers/FrmXMLHelper.php" />
+			</errorLevel>
+		</PossiblyNullArrayAssignment>
 		<PossiblyNullIterator>
 			<errorLevel type="suppress">
 				<file name="classes/models/FrmPersonalData.php" />