diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/utils/Hex.kt b/quartz/src/main/java/com/vitorpamplona/quartz/utils/Hex.kt
index 539a40ba6c..9aeb6aa410 100644
--- a/quartz/src/main/java/com/vitorpamplona/quartz/utils/Hex.kt
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/utils/Hex.kt
@@ -38,9 +38,7 @@ object Hex {
 
     @JvmStatic
     fun isHex(hex: String?): Boolean {
-        if (hex == null) return false
-        if (hex.isEmpty()) return false
-        if (hex.length and 1 != 0) return false // must be even
+        if (hex.isNullOrEmpty() || hex.length and 1 != 0) return false
 
         try {
             for (c in hex.indices) {