diff --git a/java/src/com/android/inputmethod/latin/StringUtils.java b/java/src/com/android/inputmethod/latin/StringUtils.java
index a43b90525f2f9f798b0bef34c34d93edebf7947c..6e7d985d62fbc097a6ab49111f23c21633bfd1c3 100644
--- a/java/src/com/android/inputmethod/latin/StringUtils.java
+++ b/java/src/com/android/inputmethod/latin/StringUtils.java
@@ -184,6 +184,9 @@ public class StringUtils {
         final char[] characters = string.toCharArray();
         final int length = characters.length;
         final int[] codePoints = new int[Character.codePointCount(characters, 0, length)];
+        if (length <= 0) {
+            return new int[0];
+        }
         int codePoint = Character.codePointAt(characters, 0);
         int dsti = 0;
         for (int srci = Character.charCount(codePoint);