diff --git a/android/KMEA/app/src/main/assets/keyboard.html b/android/KMEA/app/src/main/assets/keyboard.html
index 32210d3da6..5ff51d6930 100644
--- a/android/KMEA/app/src/main/assets/keyboard.html
+++ b/android/KMEA/app/src/main/assets/keyboard.html
@@ -345,7 +345,7 @@
     }
 
     function toHex(theString) {
-      if (theString == null) {
+      if (typeof theString != 'string') {
         return '';
       }
       var hexString = '';