diff --git a/history.md b/history.md
index 82cf5552..b92a5c47 100644
--- a/history.md
+++ b/history.md
@@ -1,6 +1,10 @@
 ### Version History
 
 
+#### v0.8.28
+- Minor fix in method `meico.supplementary.RandomNumberProvider.getValue(int index)` to ensure that only non-negative index values are processed.
+
+
 #### v0.8.27
 - A little optimization in method `meico.audio.Audio.convertSpectrogramToImage()`. In addition, this method has been extended with a new argument `normalize` to give applications the possibility to decide whether the spectrogram values should or should not be normalized for rendering.
 - Internal Verovio update to v3.7.0-dev-e93a13d.
diff --git a/src/meico/Meico.java b/src/meico/Meico.java
index 1f6954b6..0be65fb4 100644
--- a/src/meico/Meico.java
+++ b/src/meico/Meico.java
@@ -5,7 +5,7 @@
  * @author Axel Berndt
  */
 public class Meico {
-    public static final String version = "0.8.27";
+    public static final String version = "0.8.28";
 
     public static void main(String[] args) {
         System.out.println("meico v" + Meico.version);
diff --git a/src/meico/supplementary/RandomNumberProvider.java b/src/meico/supplementary/RandomNumberProvider.java
index 848cb4a3..88383d7e 100644
--- a/src/meico/supplementary/RandomNumberProvider.java
+++ b/src/meico/supplementary/RandomNumberProvider.java
@@ -260,6 +260,8 @@ else if (value < lowerLimit)
      * @return
      */
     public double getValue(int index) {
+        index = Math.max(0, index);             // ensure a positive index value
+
         if (this.distributionType == RandomNumberProvider.DISTRIBUTION_LIST)    // if distribution is based on predefined list
             return this.series.get(index % this.series.size());                 // read the list value and repeat the list if the index exeeds its length