diff --git a/src/main/java/com/mattrixwv/CipherStreamJava/monoSubstitution/BaseX.java b/src/main/java/com/mattrixwv/CipherStreamJava/monoSubstitution/BaseX.java
index d109752..76d5af7 100644
--- a/src/main/java/com/mattrixwv/CipherStreamJava/monoSubstitution/BaseX.java
+++ b/src/main/java/com/mattrixwv/CipherStreamJava/monoSubstitution/BaseX.java
@@ -1,7 +1,7 @@
 //CipherStreamJava/src/main/java/com/mattrixwv/CipherStreamJava/monoSubstitution/BaseX.java
 //Mattrixwv
 // Created: 01-08-22
-//Modified: 01-08-22
+//Modified: 01-09-22
 package com.mattrixwv.CipherStreamJava.monoSubstitution;
 
 
@@ -25,7 +25,7 @@ public class BaseX{
 			validNumbers.append(Integer.toString(cnt, base).toUpperCase());
 		}
 		this.inputString = inputString.replaceAll("[^" + validNumbers.toString() + "\\s]", "");
-		if(this.inputString != inputString){
+		if(!this.inputString.equals(inputString)){
 			throw new InvalidCharacterException("inputString cannot contain anything except numbers 0-" + Integer.toString(base - 1, base) + ", and whitespace");
 		}
 	}