diff --git a/SEWorldGenPlugin/Generator/SystemGenerator.cs b/SEWorldGenPlugin/Generator/SystemGenerator.cs
index 42b6799..c2a9835 100644
--- a/SEWorldGenPlugin/Generator/SystemGenerator.cs
+++ b/SEWorldGenPlugin/Generator/SystemGenerator.cs
@@ -311,7 +311,7 @@ private void ShuffleMandatoryPlanets()
             if (n <= 0) return;
             while(n > 1)
             {
-                int index = MyRandom.Instance.Next(n - 1);
+                int index = MyRandom.Instance.Next(1, n - 1);
                 var value = m_mandatoryPlanets[index];
                 m_mandatoryPlanets[index] = m_mandatoryPlanets[n];
                 m_mandatoryPlanets[n] = value;
diff --git a/SEWorldGenPlugin/Properties/AssemblyInfo.cs b/SEWorldGenPlugin/Properties/AssemblyInfo.cs
index 90a8fa8..dc5dff4 100644
--- a/SEWorldGenPlugin/Properties/AssemblyInfo.cs
+++ b/SEWorldGenPlugin/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@
 // Sie können alle Werte angeben oder Standardwerte für die Build- und Revisionsnummern verwenden,
 // indem Sie "*" wie unten gezeigt eingeben:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.7.2")]
+[assembly: AssemblyVersion("1.7.3")]
 [assembly: AssemblyFileVersion("1.0.0")]