diff --git a/GaSchedule.Algorithm/Dlba.cs b/GaSchedule.Algorithm/Dlba.cs
index 370ca3b..c8f6f92 100644
--- a/GaSchedule.Algorithm/Dlba.cs
+++ b/GaSchedule.Algorithm/Dlba.cs
@@ -31,6 +31,10 @@ public class Dlba<T> : NsgaIII<T> where T : Chromosome<T>
 		// Initializes Bat algorithm
 		public Dlba(T prototype, int numberOfCrossoverPoints = 2, int mutationSize = 2, float crossoverProbability = 80, float mutationProbability = 3) : base(prototype, numberOfCrossoverPoints, mutationSize, crossoverProbability, mutationProbability)
 		{
+			// there should be at least 5 chromosomes in population
+			if (_populationSize < 5)
+				_populationSize = 5;
+
 			_alpha = 0.9;
 			_pa = .25;
 		}
@@ -81,10 +85,10 @@ private void UpdatePositions(List<T> population)
 		{
 			var mean = _loudness.Average();
 			if(_gBest == null)
-				_gBest = _position[0];
-			var prevBest = _prototype.MakeEmptyFromPrototype();
-			prevBest.UpdatePositions(_gBest);
-
+				_gBest = _position[0];
+			var prevBest = _prototype.MakeEmptyFromPrototype();
+			prevBest.UpdatePositions(_gBest);
+
 			for (int i = 0; i < _populationSize; ++i) {
 				var beta = (float) Configuration.Random();
 				var rand = Configuration.Random();
diff --git a/GaSchedule.Algorithm/Fpa.cs b/GaSchedule.Algorithm/Fpa.cs
index 883d7b9..57509d3 100644
--- a/GaSchedule.Algorithm/Fpa.cs
+++ b/GaSchedule.Algorithm/Fpa.cs
@@ -27,7 +27,11 @@ public class Fpa<T> : NsgaIII<T> where T : Chromosome<T>
 
 		// Initializes Flower Pollination Algorithm
 		public Fpa(T prototype, int numberOfCrossoverPoints = 2, int mutationSize = 2, float crossoverProbability = 80, float mutationProbability = 3) : base(prototype, numberOfCrossoverPoints, mutationSize, crossoverProbability, mutationProbability)
-		{
+		{
+			// there should be at least 5 chromosomes in population
+			if (_populationSize < 5)
+				_populationSize = 5;
+
 			_pa = .25;
 		}